测试一个configserver服务器挂机后，集群是否能读写数据
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测试架构：
测试目的：
测试一个config server 服务器挂机后，集群是否能读写数据。
测试原因：
上周因为内存吃紧，准备添加内存。在查看服务器时，把一台服务器关机检查。
关机后，WEB 端应用出错，用户无法登录，所有都出错。
但在我理解，因为CONFIG是3台冗余的，一台关机，应该不会产生影响才对，或者说不会影响到无法
登录，应用不能正常运行。只是会有数据不均衡啊。
但我使用mongochef 登录，确实登录数据库不成功。
测试结果：
经下面的测试，印证了我的理解，一台config 宕机，只是会提示连接config 出错，
但能登录数据库，插入数据的代码（mongo -port 28000 登录后运行的JS 代码），还能正常运行下去。
但为什么当时WEB 端会出错，我看到他们php 配置文件中如下：
$connect = new MongoClient("mongodb://192.168.2.188:28000,192.168.2.132:28000", array("replicaSet" => "myReplSet"));
却没加MongoConnectionException。 容错出错没有的话，当正在操作时，一个collection打开出错，不会再重新连接数据库，
就报错了。如果这时能重新连接数据库，应该能再找到另外正常的节点连接的。
测试环境为： mongodb3.0.3
2个shard，3个配置config，3个mongos
set host：port stateStr
------------------------------------------------------------
shard1 192.168.2.188:28011 PRIMARY
shard1 192.168.2.132:28011 SECONDARY
shard1 192.168.2.134:28011 SECONDARY
shard2 192.168.2.188:28012 SECONDARY
shard2 192.168.2.132:28012 SECONDARY
shard2 192.168.2.134:28012 PRIMARY
--------------------------------------------------------------------
192.168.2.188:28010 config
192.168.2.188:28000 mongos
192.168.2.132:28010 config
192.168.2.132:28000 mongos
192.168.2.134:28010 config
192.168.2.134:28000 mongos
#备用服务器，当134挂机后，把134 对应的t3 服务器名称修改为 135
192.168.2.135:28010 config
各服务器的hosts 文件：
[root@localhost bin]# cat /etc/hosts
192.168.2.188 t1
192.168.2.132 t2
192.168.2.134 t3
192.168.2.135 t4
一、配置集群：
初始化replica set shard1
用mongo 连接其中一个节点： 比如：shard11 执行以下：
> config = {_id: \'shard1\', members: [
{_id: 0, host:\'t1:28011\'}]
}
> rs.initiate(config);
rs.add({_id: 1, host:\'t2:28011\'})
rs.add({_id: 2, host:\'t3:28011\'})
初始化replica set shard2
用mongo 连接其中一个节点： 比如：shard11 执行以下：
> config = {_id: \'shard2\', members: [
{_id: 0, host:\'t1:28012\'}]
}
> rs.initiate(config);
rs.add({_id: 1, host:\'t2:28012\'})
rs.add({_id: 2, host:\'t3:28012\'})
#遇到如下错误
shard2:PRIMARY> rs.add({_id: 1, host:\'t2:28012\'})
{
"ok" : 0,
"errmsg" : "Quorum check failed because not enough voting nodes responded; required 2 but only the following 1 voting nodes responded: t1:28012; the following nodes did not respond affirmatively: t2:28012 failed with Failed attempt to connect to t2:28012; couldn\'t connect to server t2:28012 (192.168.2.132), connection attempt failed",
"code" : 74
}
#原因：有防火墙
#关闭防火墙
[root@t2 ~]# chkconfig iptables off
[root@t2 ~]# service iptables stop
iptables：清除防火墙规则： [确定]
iptables：将链设置为政策 ACCEPT：nat mangle filter [确定]
iptables：正在卸载模块： [确定]
[root@t2 ~]#
二、配置分片
1：配置一下时间一致，不然无法建立分片集群：
*/5 * * * * /usr/sbin/ntpdate -u ntp.sjtu.edu.cn
2.mongos 运行时的参数如下：
/opt/mongodb3.0.3/bin/mongos --configdb t1:28010,t2:28010,t3:28010 --port 28000 --logpath /opt/mongodb3.0.3/logs/mongos.log --logappend --fork
3.连接到其中一个mongos进程，并切换到admin数据库做以下配置
3.1. 连接到mongs，并切换到admin
./mongo 192.168.20.11:28000/admin
>db
Admin
3.2. 加入shards
命令格式：
replicaSetName/[:port] [,serverhostname2[:port],…]
执行如下：
>use admin;
>db.runCommand({addshard:"shard1/t1:28011,t2:28011,t3:28011"});
>db.runCommand({addshard:"shard2/t1:28012,t2:28012,t3:28012"});
添加分片后，把chunksize 改成 1M，以方便测试
>use config
mongos> db.shards.find()
{ "_id" : "shard1", "host" : "shard1/t1:28011,t2:28011,t3:28011" }
{ "_id" : "shard2", "host" : "shard2/t1:28012,t2:28012,t3:28012" }
mongos> db.settings.find()
{ "_id" : "chunksize", "value" : 64 }
mongos> db.settings.update({_id:\'chunksize\'},{$set:{value:1}})
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })
mongos> db.settings.find()
{ "_id" : "chunksize", "value" : 1 }
mongos>
到此分片集群配置已完成
三、添加数据
db.runCommand({"enablesharding":"test"})
db.runCommand({shardcollection:"test.customer",key:{_id:1}});
#表中插入数据：
use test;
for (i = 1; i <= 90000; i++){
db.customer.insert({_id:i,name:\' test name test name test name test name test name test name test name test name test name end\',
address:\'address test customer al;dkjfa;lsdfjsal;#^end\',province:\'test customer province\',city:\'test customer city\'});
}
用于测试时查看各数据所在的分片。
从下面的查询中，可以看到test.customer数据已分片到shard1,shard2
mongos> db.chunks.find()
{ "_id" : "test.customer-_id_MinKey", "lastmod" : Timestamp(2, 1), "lastmodEpoch" : ObjectId("55b99f3ff5ddb9333eda7464"), "ns" : "test.customer", "min" : { "_id" : { "$minKey" : 1 } }, "max" : { "_id" : 2 }, "shard" : "shard2" }
{ "_id" : "test.customer-_id_2.0", "lastmod" : Timestamp(1, 2), "lastmodEpoch" : ObjectId("55b99f3ff5ddb9333eda7464"), "ns" : "test.customer", "min" : { "_id" : 2 }, "max" : { "_id" : 6 }, "shard" : "shard2" }
{ "_id" : "test.customer-_id_6.0", "lastmod" : Timestamp(2, 2), "lastmodEpoch" : ObjectId("55b99f3ff5ddb9333eda7464"), "ns" : "test.customer", "min" : { "_id" : 6 }, "max" : { "_id" : 2120 }, "shard" : "shard1" }
{ "_id" : "test.customer-_id_2120.0", "lastmod" : Timestamp(2, 3), "lastmodEpoch" : ObjectId("55b99f3ff5ddb9333eda7464"), "ns" : "test.customer", "min" : { "_id" : 2120 }, "max" : { "_id" : 4579 }, "shard" : "shard1" }
{ "_id" : "test.customer-_id_4579.0", "lastmod" : Timestamp(2, 5), "lastmodEpoch" : ObjectId("55b99f3ff5ddb9333eda7464"), "ns" : "test.customer", "min" : { "_id" : 4579 }, "max" : { "_id" : 6693 }, "shard" : "shard1" }
{ "_id" : "test.customer-_id_6693.0", "lastmod" : Timestamp(2, 6), "lastmodEpoch" : ObjectId("55b99f3ff5ddb9333eda7464"), "ns" : "test.customer", "min" : { "_id" : 6693 }, "max" : { "_id" : 9371 }, "shard" : "shard1" }
{ "_id" : "test.customer-_id_9371.0", "lastmod" : Timestamp(2, 7), "lastmodEpoch" : ObjectId("55b99f3ff5ddb9333eda7464"), "ns" : "test.customer", "min" : { "_id" : 9371 }, "max" : { "_id" : { "$maxKey" : 1 } }, "shard" : "shard1" }
mongos> db.collections.find()
{ "_id" : "test.customer", "lastmod" : ISODate("2015-07-30T03:51:28.671Z"), "dropped" : false, "key" : { "_id" : 1 }, "unique" : false, "lastmodEpoch" : ObjectId("55b99f3ff5ddb9333eda7464") }
mongos>
四、测试挂掉一个config:
4.1
[mongo@localhost bin]$ ll /opt/mongodb3.0.3/config
总用量 0
[mongo@localhost bin]$ ./configd_start.sh
about to fork child process, waiting until server is ready for connections.
forked process: 2638
child process started successfully, parent exiting
[mongo@localhost bin]$ ps -ef|grep mongod
mongo 2455 1 28 10:51 ? 00:04:14 /opt/mongodb3.0.3/bin/mongod --storageEngine wiredTiger -f shard1.conf
mongo 2518 1 7 10:51 ? 00:01:11 /opt/mongodb3.0.3/bin/mongod --storageEngine wiredTiger -f shard2.conf
mongo 2638 1 7 10:53 ? 00:00:59 /opt/mongodb3.0.3/bin/mongod --storageEngine wiredTiger -f configsvr.conf
mongo 2931 2083 8 11:06 pts/0 00:00:00 grep mongod
[mongo@localhost bin]$ kill -9 2638
[mongo@localhost bin]$ ps -ef|grep mongod
mongo 2455 1 27 10:51 ? 00:04:16 /opt/mongodb3.0.3/bin/mongod --storageEngine wiredTiger -f shard1.conf
mongo 2518 1 7 10:51 ? 00:01:13 /opt/mongodb3.0.3/bin/mongod --storageEngine wiredTiger -f shard2.conf
mongo 2941 2083 6 11:06 pts/0 00:00:00 grep mongod
[mongo@localhost bin]$
#t1登录没问题
[mongo@t1 bin]$ ./mongo -port 28000
MongoDB shell version: 3.0.3
connecting to: 127.0.0.1:28000/test
mongos> show dbs;
admin (empty)
config (empty)
test 0.002GB
mongos>
#t2登录 也没问题
[mongo@t2 bin]$ ./mongo -port 28000
MongoDB shell version: 3.0.3
connecting to: 127.0.0.1:28000/test
mongos>
#同样，使用mongochef 客户端登录，也同样验证了上面的问题，
4.2.
把分片从hostname修改成ip:
> config = {_id: \'shard1\', members: [
{_id: 0, host:\'192.168.2.188:28011\'}]
}
> rs.initiate(config);
rs.add({_id: 1, host:\'192.168.2.132:28011\'})
rs.add({_id: 2, host:\'192.168.2.134:28011\'})
> config = {_id: \'shard2\', members: [
{_id: 0, host:\'192.168.2.188:28012\'}]
}
> rs.initiate(config);
rs.add({_id: 1, host:\'192.168.2.132:28012\'})
rs.add({_id: 2, host:\'192.168.2.134:28012\'})
#把mongos 的参数中的hostname也修改成IP
[mongo@t1 bin]$ cat mongos_router.sh
/opt/mongodb3.0.3/bin/mongos --configdb 192.168.2.188:28010,192.168.2.132:28010,192.168.2.134:28010 --port 28000 --logpath /opt/mongodb3.0.3/logs/mongos.log --logappend --fork
[mongo@t1 bin]$
#添加分片，把chunksize 改成 1M，以方便测试
>use admin;
>db.runCommand({addshard:"shard1/192.168.2.188:28011,192.168.2.132:28011,192.168.2.134:28011"});
>db.runCommand({addshard:"shard2/192.168.2.188:28012,192.168.2.132:28012,192.168.2.134:28012"});
db.settings.update({_id:\'chunksize\'},{$set:{value:1}})
#当所有配置设置成使用IP后，宕掉config server.
#再从本机尝试连接，发现不成功。
[mongo@localhost bin]$ ps -ef|grep mongod
mongo 4062 1 10 11:48 ? 00:09:56 /opt/mongodb3.0.3/bin/mongod --storageEngine wiredTiger -f shard1.conf
mongo 4082 1 8 11:48 ? 00:08:09 /opt/mongodb3.0.3/bin/mongod --storageEngine wiredTiger -f shard2.conf
mongo 4102 1 11 11:48 ? 00:10:45 /opt/mongodb3.0.3/bin/mongod --storageEngine wiredTiger -f configsvr.conf
mongo 4121 1 5 11:49 ? 00:04:55 /opt/mongodb3.0.3/bin/mongos --configdb 192.168.2.188:28010,192.168.2.132:28010,192.168.2.134:28010 --logpath /opt/mongodb3.0.3/logs/mongos.log --logappend --fork
root 9459 9420 0 13:23 pts/1 00:00:00 tail -330f /opt/mongodb3.0.3/logs/shard1.log
mongo 9471 2083 5 13:23 pts/0 00:00:00 grep mongod
[mongo@localhost bin]$ kill -9 4102
[mongo@localhost bin]$ ps -ef|grep mongod
mongo 4062 1 10 11:48 ? 00:10:20 /opt/mongodb3.0.3/bin/mongod --storageEngine wiredTiger -f shard1.conf
mongo 4082 1 8 11:48 ? 00:08:18 /opt/mongodb3.0.3/bin/mongod --storageEngine wiredTiger -f shard2.conf
mongo 4121 1 5 11:49 ? 00:04:59 /opt/mongodb3.0.3/bin/mongos --configdb 192.168.2.188:28010,192.168.2.132:28010,192.168.2.134:28010 --logpath /opt/mongodb3.0.3/logs/mongos.log --logappend --fork
root 9459 9420 0 13:23 pts/1 00:00:00 tail -330f /opt/mongodb3.0.3/logs/shard1.log
mongo 9488 2083 5 13:24 pts/0 00:00:00 grep mongod
[mongo@localhost bin]$ ./mongo -port 28000
MongoDB shell version: 3.0.3
connecting to: 127.0.0.1:28000/test
2015-07-31T13:25:52.166+0800 W NETWORK Failed to connect to 127.0.0.1:28000, reason: errno:111 Connection refused
2015-07-31T13:25:53.514+0800 E QUERY Error: couldn\'t connect to server 127.0.0.1:28000 (127.0.0.1), connection attempt failed
at connect (src/mongo/shell/mongo.js:181:14)
at (connect):1:6 at src/mongo/shell/mongo.js:181
exception: connect failed
[mongo@localhost bin]$ ./mongo -port 28000
MongoDB shell version: 3.0.3
connecting to: 127.0.0.1:28000/test
2015-07-31T13:26:30.823+0800 W NETWORK Failed to connect to 127.0.0.1:28000, reason: errno:111 Connection refused
2015-07-31T13:26:32.929+0800 E QUERY Error: couldn\'t connect to server 127.0.0.1:28000 (127.0.0.1), connection attempt failed
at connect (src/mongo/shell/mongo.js:181:14)
at (connect):1:6 at src/mongo/shell/mongo.js:181
exception: connect failed
[mongo@localhost bin]$ ps -ef|grep mongod
mongo 4062 1 12 11:48 ? 00:11:48 /opt/mongodb3.0.3/bin/mongod --storageEngine wiredTiger -f shard1.conf
mongo 4082 1 8 11:48 ? 00:08:29 /opt/mongodb3.0.3/bin/mongod --storageEngine wiredTiger -f shard2.conf
mongo 4121 1 5 11:49 ? 00:05:09 /opt/mongodb3.0.3/bin/mongos --configdb 192.168.2.188:28010,192.168.2.132:28010,192.168.2.134:28010 --logpath /opt/mongodb3.0.3/logs/mongos.log --logappend --fork
root 9459 9420 0 13:23 pts/1 00:00:00 tail -330f /opt/mongodb3.0.3/logs/shard1.log
mongo 9754 2083 7 13:26 pts/0 00:00:00 grep mongod
[mongo@localhost bin]$ ./mongo -port 28000
MongoDB shell version: 3.0.3
connecting to: 127.0.0.1:28000/test
2015-07-31T13:28:17.397+0800 W NETWORK Failed to connect to 127.0.0.1:28000, reason: errno:111 Connection refused
2015-07-31T13:28:19.161+0800 E QUERY Error: couldn\'t connect to server 127.0.0.1:28000 (127.0.0.1), connection attempt failed
at connect (src/mongo/shell/mongo.js:181:14)
at (connect):1:6 at src/mongo/shell/mongo.js:181
exception: connect failed
[mongo@localhost bin]$
#而其它节点（t2,t1）服务器连接没有问题。使用mongochef 测试，也印证了这点。
是否说使用Ip地址，真的是在服务器集群中，稳定性会差一些呢。
并且我同在宕掉config server. 时，测试循环插入数据的代码没有中止。后面也一直在插入数据。
[mongo@t2 bin]$ ./mongo -port 28000
MongoDB shell version: 3.0.3
connecting to: 127.0.0.1:28000/test
mongos>
connecting to: 127.0.0.1:28000/test
mongos> db.customer.count()
10024
mongos> db.customer.count()
10091
mongos> db.customer.count()
10103
mongos>
可以从下面的日志中看到这点：
2015-07-31T13:34:55.114+0800 I NETWORK [LockPinger] trying reconnect to 192.168.2.134:28010 (192.168.2.134) failed
2015-07-31T13:34:55.328+0800 W NETWORK [LockPinger] Failed to connect to 192.168.2.134:28010, reason: errno:111 Connection refused
2015-07-31T13:34:55.383+0800 I WRITE [conn258] insert test.customer query: { _id: 11119.0, name: " test name test name test name test name test name test name test name test name test name end", address: "address test customer al;dkjfa;lsdfjsal;#^end", province: "test customer province", city: "test customer city" } ninserted:1 keyUpdates:0 writeConflicts:0 numYields:0 locks:{ Global: { acquireCount: { w: 2 } }, Database: { acquireCount: { w: 2 } }, Collection: { acquireCount: { w: 1 } }, oplog: { acquireCount: { w: 1 } } } 115ms
2015-07-31T13:34:55.419+0800 I NETWORK [LockPinger] reconnect 192.168.2.134:28010 (192.168.2.134) failed failed couldn\'t connect to server 192.168.2.134:28010 (192.168.2.134), connection attempt failed
2015-07-31T13:34:55.556+0800 I COMMAND [conn258] command test.$cmd command: insert { insert: "customer", documents: [ { _id: 11119.0, name: " test name test name test name test name test name test name test name test name test name end", address: "address test customer al;dkjfa;lsdfjsal;#^end", province: "test customer province", city: "test customer city" } ], ordered: true, metadata: { shardName: "shard1", shardVersion: [ Timestamp 4000|1, ObjectId(\'55bb0603bb39501b3b7c2934\') ], session: 0 } } ntoreturn:1 keyUpdates:0 writeConflicts:0 numYields:0 reslen:140 locks:{ Global: { acquireCount: { w: 2 } }, Database: { acquireCount: { w: 2 } }, Collection: { acquireCount: { w: 1 } }, oplog: { acquireCount: { w: 1 } } } 312ms
2015-07-31T13:34:55.618+0800 I NETWORK [LockPinger] scoped connection to 192.168.2.188:28010,192.168.2.132:28010,192.168.2.134:28010 not being returned to the pool
2015-07-31T13:34:55.714+0800 W SHARDING [LockPinger] distributed lock pinger \'192.168.2.188:28010,192.168.2.132:28010,192.168.2.134:28010/t3:28011:1438320143:660128477\' detected an exception while pinging. :: caused by :: SyncClusterConnection::update prepare failed: 192.168.2.134:28010 (192.168.2.134) failed:9001 socket exception [CONNECT_ERROR] server [192.168.2.134:28010 (192.168.2.134) failed]
2015-07-31T13:34:55.773+0800 I COMMAND [conn258] command test.$cmd command: insert { insert: "customer", documents: [ { _id: 11120.0, name: " test name test name test name test name test name test name test name test name test name end", address: "address test customer al;dkjfa;lsdfjsal;#^end", province: "test customer province", city: "test customer city" } ], ordered: true, metadata: { shardName: "shard1", shardVersion: [ Timestamp 4000|1, ObjectId(\'55bb0603bb39501b3b7c2934\') ], session: 0 } } ntoreturn:1 keyUpdates:0 writeConflicts:0 numYields:0 reslen:140 locks:{ Global: { acquireCount: { w: 2 } }, Database: { acquireCount: { w: 2 } }, Collection: { acquireCount: { w: 1 } }, oplog: { acquireCount: { w: 1 } } } 105ms
2015-07-31T13:34:56.034+0800 I WRITE [conn258] insert test.customer query: { _id: 11121.0, name: " test name test name test name test name test name test name test name test name test name end", address: "address test customer al;dkjfa;lsdfjsal;#^end", province: "test customer province", city: "test customer city" } ninserted:1 keyUpdates:0 writeConflicts:0 numYields:0 locks:{ Global: { acquireCount: { w: 2 } }, Database: { acquireCount: { w: 2 } }, Collection: { acquireCount: { w: 1 } }, oplog: { acquireCount: { w: 1 } } } 114ms
2015-07-31T13:34:56.161+0800 I COMMAND [conn258] command test.$cmd command: insert { insert: "customer", documents: [ { _id: 11121.0, name: " test name test name test name test name test name test name test name test name test name end", address: "address test customer al;dkjfa;lsdfjsal;#^end", province: "test customer province", city: "test customer city" } ], ordered: true, metadata: { shardName: "shard1", shardVersion: [ Timestamp 4000|1, ObjectId(\'55bb0603bb39501b3b7c2934\') ], session: 0 } } ntoreturn:1 keyUpdates:0 writeConflicts:0 numYields:0 reslen:140 locks:{ Global: { acquireCount: { w: 2 } }, Database: { acquireCount: { w: 2 } }, Collection: { acquireCount: { w: 1 } }, oplog: { acquireCount: { w: 1 } } } 256ms
2015-07-31T13:34:56.367+0800 I COMMAND [conn258] command test.$cmd command: insert { insert: "customer", documents: [ { _id: 11122.0, name: " test name test name test name test name test name test name test name test name test name end", address: "address test customer al;dkjfa;lsdfjsal;#^end", province: "test customer province", city: "test customer city" } ], ordered: true, metadata: { shardName: "shard1", shardVersion: [ Timestamp 4000|1, ObjectId(\'55bb0603bb39501b3b7c2934\') ], session: 0 } } ntoreturn:1 keyUpdates:0 writeConflicts:0 numYields:0 reslen:140 locks:{ Global: { acquireCount: { w: 2 } }, Database: { acquireCount: { w: 2 } }, Collection: { acquireCount: { w: 1 } }, oplog: { acquireCount: { w: 1 } } } 110ms
#重启config 后，再登录也出错。
可能是本机mongos 已记录没找到config ，后再重启mongos ，全部正常。
这有点说不过去。
[mongo@localhost bin]$ ./configd_start.sh
about to fork child process, waiting until server is ready for connections.
forked process: 12102
child process started successfully, parent exiting
[mongo@localhost bin]$ ./mongo -port 28000
MongoDB shell version: 3.0.3
connecting to: 127.0.0.1:28000/test
2015-07-31T13:46:49.324+0800 W NETWORK Failed to connect to 127.0.0.1:28000, reason: errno:111 Connection refused
2015-07-31T13:46:50.747+0800 E QUERY Error: couldn\'t connect to server 127.0.0.1:28000 (127.0.0.1), connection attempt failed
at connect (src/mongo/shell/mongo.js:181:14)
at (connect):1:6 at src/mongo/shell/mongo.js:181
exception: connect failed
[mongo@localhost bin]$ ps -ef|grep mongod
mongo 4062 1 23 11:48 ? 00:27:18 /opt/mongodb3.0.3/bin/mongod --storageEngine wiredTiger -f shard1.conf
mongo 4082 1 8 11:48 ? 00:10:29 /opt/mongodb3.0.3/bin/mongod --storageEngine wiredTiger -f shard2.conf
mongo 4121 1 5 11:49 ? 00:06:56 /opt/mongodb3.0.3/bin/mongos --configdb 192.168.2.188:28010,192.168.2.132:28010,192.168.2.134:28010 --logpath /opt/mongodb3.0.3/logs/mongos.log --logappend --fork
root 11468 9420 0 13:40 pts/1 00:00:01 tail -330f /opt/mongodb3.0.3/logs/shard1.log
mongo 12102 1 12 13:46 ? 00:00:05 /opt/mongodb3.0.3/bin/mongod --storageEngine wiredTiger -f configsvr.conf
mongo 12190 2083 3 13:46 pts/0 00:00:00 grep mongod
[mongo@localhost bin]$ kill -9 4121
[mongo@localhost bin]$ ./mongos_router.sh
about to fork child process, waiting until server is ready for connections.
forked process: 12220
child process started successfully, parent exiting
[mongo@localhost bin]$ ps -ef|grep mongod
mongo 4062 1 23 11:48 ? 00:27:57 /opt/mongodb3.0.3/bin/mongod --storageEngine wiredTiger -f shard1.conf
mongo 4082 1 9 11:48 ? 00:11:09 /opt/mongodb3.0.3/bin/mongod --storageEngine wiredTiger -f shard2.conf
root 11468 9420 0 13:40 pts/1 00:00:01 tail -330f /opt/mongodb3.0.3/logs/shard1.log
mongo 12102 1 19 13:46 ? 00:00:31 /opt/mongodb3.0.3/bin/mongod --storageEngine wiredTiger -f configsvr.conf
mongo 12220 1 5 13:47 ? 00:00:04 /opt/mongodb3.0.3/bin/mongos --configdb 192.168.2.188:28010,192.168.2.132:28010,192.168.2.134:28010 --logpath /opt/mongodb3.0.3/logs/mongos.log --logappend --fork
mongo 12299 2083 3 13:48 pts/0 00:00:00 grep mongod
[mongo@localhost bin]$ ./mongo -port 28000
MongoDB shell version: 3.0.3
cfg = rs.conf()
cfg.members[0].priority = 2;
cfg.members[1].priority = 3;
cfg.members[2].priority = 1;
rs.reconfig(cfg);
测试目的：
测试一个config server 服务器挂机后，集群是否能读写数据。
测试原因：
上周因为内存吃紧，准备添加内存。在查看服务器时，把一台服务器关机检查。
关机后，WEB 端应用出错，用户无法登录，所有都出错。
但在我理解，因为CONFIG是3台冗余的，一台关机，应该不会产生影响才对，或者说不会影响到无法
登录，应用不能正常运行。只是会有数据不均衡啊。
但我使用mongochef 登录，确实登录数据库不成功。
测试结果：
经下面的测试，印证了我的理解，一台config 宕机，只是会提示连接config 出错，
但能登录数据库，插入数据的代码（mongo -port 28000 登录后运行的JS 代码），还能正常运行下去。
但为什么当时WEB 端会出错，我看到他们php 配置文件中如下：
$connect = new MongoClient("mongodb://192.168.2.188:28000,192.168.2.132:28000", array("replicaSet" => "myReplSet"));
却没加MongoConnectionException。 容错出错没有的话，当正在操作时，一个collection打开出错，不会再重新连接数据库，
就报错了。如果这时能重新连接数据库，应该能再找到另外正常的节点连接的。
测试环境为： mongodb3.0.3
2个shard，3个配置config，3个mongos
set host：port stateStr
------------------------------------------------------------
shard1 192.168.2.188:28011 PRIMARY
shard1 192.168.2.132:28011 SECONDARY
shard1 192.168.2.134:28011 SECONDARY
shard2 192.168.2.188:28012 SECONDARY
shard2 192.168.2.132:28012 SECONDARY
shard2 192.168.2.134:28012 PRIMARY
--------------------------------------------------------------------
192.168.2.188:28010 config
192.168.2.188:28000 mongos
192.168.2.132:28010 config
192.168.2.132:28000 mongos
192.168.2.134:28010 config
192.168.2.134:28000 mongos
#备用服务器，当134挂机后，把134 对应的t3 服务器名称修改为 135
192.168.2.135:28010 config
各服务器的hosts 文件：
[root@localhost bin]# cat /etc/hosts
192.168.2.188 t1
192.168.2.132 t2
192.168.2.134 t3
192.168.2.135 t4
一、配置集群：
初始化replica set shard1
用mongo 连接其中一个节点： 比如：shard11 执行以下：
> config = {_id: \'shard1\', members: [
{_id: 0, host:\'t1:28011\'}]
}
> rs.initiate(config);
rs.add({_id: 1, host:\'t2:28011\'})
rs.add({_id: 2, host:\'t3:28011\'})
初始化replica set shard2
用mongo 连接其中一个节点： 比如：shard11 执行以下：
> config = {_id: \'shard2\', members: [
{_id: 0, host:\'t1:28012\'}]
}
> rs.initiate(config);
rs.add({_id: 1, host:\'t2:28012\'})
rs.add({_id: 2, host:\'t3:28012\'})
#遇到如下错误
shard2:PRIMARY> rs.add({_id: 1, host:\'t2:28012\'})
{
"ok" : 0,
"errmsg" : "Quorum check failed because not enough voting nodes responded; required 2 but only the following 1 voting nodes responded: t1:28012; the following nodes did not respond affirmatively: t2:28012 failed with Failed attempt to connect to t2:28012; couldn\'t connect to server t2:28012 (192.168.2.132), connection attempt failed",
"code" : 74
}
#原因：有防火墙
#关闭防火墙
[root@t2 ~]# chkconfig iptables off
[root@t2 ~]# service iptables stop
iptables：清除防火墙规则： [确定]
iptables：将链设置为政策 ACCEPT：nat mangle filter [确定]
iptables：正在卸载模块： [确定]
[root@t2 ~]#
二、配置分片
1：配置一下时间一致，不然无法建立分片集群：
*/5 * * * * /usr/sbin/ntpdate -u ntp.sjtu.edu.cn
2.mongos 运行时的参数如下：
/opt/mongodb3.0.3/bin/mongos --configdb t1:28010,t2:28010,t3:28010 --port 28000 --logpath /opt/mongodb3.0.3/logs/mongos.log --logappend --fork
3.连接到其中一个mongos进程，并切换到admin数据库做以下配置
3.1. 连接到mongs，并切换到admin
./mongo 192.168.20.11:28000/admin
>db
Admin
3.2. 加入shards
命令格式：
replicaSetName/[:port] [,serverhostname2[:port],…]
执行如下：
>use admin;
>db.runCommand({addshard:"shard1/t1:28011,t2:28011,t3:28011"});
>db.runCommand({addshard:"shard2/t1:28012,t2:28012,t3:28012"});
添加分片后，把chunksize 改成 1M，以方便测试
>use config
mongos> db.shards.find()
{ "_id" : "shard1", "host" : "shard1/t1:28011,t2:28011,t3:28011" }
{ "_id" : "shard2", "host" : "shard2/t1:28012,t2:28012,t3:28012" }
mongos> db.settings.find()
{ "_id" : "chunksize", "value" : 64 }
mongos> db.settings.update({_id:\'chunksize\'},{$set:{value:1}})
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })
mongos> db.settings.find()
{ "_id" : "chunksize", "value" : 1 }
mongos>
到此分片集群配置已完成
三、添加数据
db.runCommand({"enablesharding":"test"})
db.runCommand({shardcollection:"test.customer",key:{_id:1}});
#表中插入数据：
use test;
for (i = 1; i <= 90000; i++){
db.customer.insert({_id:i,name:\' test name test name test name test name test name test name test name test name test name end\',
address:\'address test customer al;dkjfa;lsdfjsal;#^end\',province:\'test customer province\',city:\'test customer city\'});
}
用于测试时查看各数据所在的分片。
从下面的查询中，可以看到test.customer数据已分片到shard1,shard2
mongos> db.chunks.find()
{ "_id" : "test.customer-_id_MinKey", "lastmod" : Timestamp(2, 1), "lastmodEpoch" : ObjectId("55b99f3ff5ddb9333eda7464"), "ns" : "test.customer", "min" : { "_id" : { "$minKey" : 1 } }, "max" : { "_id" : 2 }, "shard" : "shard2" }
{ "_id" : "test.customer-_id_2.0", "lastmod" : Timestamp(1, 2), "lastmodEpoch" : ObjectId("55b99f3ff5ddb9333eda7464"), "ns" : "test.customer", "min" : { "_id" : 2 }, "max" : { "_id" : 6 }, "shard" : "shard2" }
{ "_id" : "test.customer-_id_6.0", "lastmod" : Timestamp(2, 2), "lastmodEpoch" : ObjectId("55b99f3ff5ddb9333eda7464"), "ns" : "test.customer", "min" : { "_id" : 6 }, "max" : { "_id" : 2120 }, "shard" : "shard1" }
{ "_id" : "test.customer-_id_2120.0", "lastmod" : Timestamp(2, 3), "lastmodEpoch" : ObjectId("55b99f3ff5ddb9333eda7464"), "ns" : "test.customer", "min" : { "_id" : 2120 }, "max" : { "_id" : 4579 }, "shard" : "shard1" }
{ "_id" : "test.customer-_id_4579.0", "lastmod" : Timestamp(2, 5), "lastmodEpoch" : ObjectId("55b99f3ff5ddb9333eda7464"), "ns" : "test.customer", "min" : { "_id" : 4579 }, "max" : { "_id" : 6693 }, "shard" : "shard1" }
{ "_id" : "test.customer-_id_6693.0", "lastmod" : Timestamp(2, 6), "lastmodEpoch" : ObjectId("55b99f3ff5ddb9333eda7464"), "ns" : "test.customer", "min" : { "_id" : 6693 }, "max" : { "_id" : 9371 }, "shard" : "shard1" }
{ "_id" : "test.customer-_id_9371.0", "lastmod" : Timestamp(2, 7), "lastmodEpoch" : ObjectId("55b99f3ff5ddb9333eda7464"), "ns" : "test.customer", "min" : { "_id" : 9371 }, "max" : { "_id" : { "$maxKey" : 1 } }, "shard" : "shard1" }
mongos> db.collections.find()
{ "_id" : "test.customer", "lastmod" : ISODate("2015-07-30T03:51:28.671Z"), "dropped" : false, "key" : { "_id" : 1 }, "unique" : false, "lastmodEpoch" : ObjectId("55b99f3ff5ddb9333eda7464") }
mongos>
四、测试挂掉一个config:
4.1
[mongo@localhost bin]$ ll /opt/mongodb3.0.3/config
总用量 0
[mongo@localhost bin]$ ./configd_start.sh
about to fork child process, waiting until server is ready for connections.
forked process: 2638
child process started successfully, parent exiting
[mongo@localhost bin]$ ps -ef|grep mongod
mongo 2455 1 28 10:51 ? 00:04:14 /opt/mongodb3.0.3/bin/mongod --storageEngine wiredTiger -f shard1.conf
mongo 2518 1 7 10:51 ? 00:01:11 /opt/mongodb3.0.3/bin/mongod --storageEngine wiredTiger -f shard2.conf
mongo 2638 1 7 10:53 ? 00:00:59 /opt/mongodb3.0.3/bin/mongod --storageEngine wiredTiger -f configsvr.conf
mongo 2931 2083 8 11:06 pts/0 00:00:00 grep mongod
[mongo@localhost bin]$ kill -9 2638
[mongo@localhost bin]$ ps -ef|grep mongod
mongo 2455 1 27 10:51 ? 00:04:16 /opt/mongodb3.0.3/bin/mongod --storageEngine wiredTiger -f shard1.conf
mongo 2518 1 7 10:51 ? 00:01:13 /opt/mongodb3.0.3/bin/mongod --storageEngine wiredTiger -f shard2.conf
mongo 2941 2083 6 11:06 pts/0 00:00:00 grep mongod
[mongo@localhost bin]$
#t1登录没问题
[mongo@t1 bin]$ ./mongo -port 28000
MongoDB shell version: 3.0.3
connecting to: 127.0.0.1:28000/test
mongos> show dbs;
admin (empty)
config (empty)
test 0.002GB
mongos>
#t2登录 也没问题
[mongo@t2 bin]$ ./mongo -port 28000
MongoDB shell version: 3.0.3
connecting to: 127.0.0.1:28000/test
mongos>
#同样，使用mongochef 客户端登录，也同样验证了上面的问题，
4.2.
把分片从hostname修改成ip:
> config = {_id: \'shard1\', members: [
{_id: 0, host:\'192.168.2.188:28011\'}]
}
> rs.initiate(config);
rs.add({_id: 1, host:\'192.168.2.132:28011\'})
rs.add({_id: 2, host:\'192.168.2.134:28011\'})
> config = {_id: \'shard2\', members: [
{_id: 0, host:\'192.168.2.188:28012\'}]
}
> rs.initiate(config);
rs.add({_id: 1, host:\'192.168.2.132:28012\'})
rs.add({_id: 2, host:\'192.168.2.134:28012\'})
#把mongos 的参数中的hostname也修改成IP
[mongo@t1 bin]$ cat mongos_router.sh
/opt/mongodb3.0.3/bin/mongos --configdb 192.168.2.188:28010,192.168.2.132:28010,192.168.2.134:28010 --port 28000 --logpath /opt/mongodb3.0.3/logs/mongos.log --logappend --fork
[mongo@t1 bin]$
#添加分片，把chunksize 改成 1M，以方便测试
>use admin;
>db.runCommand({addshard:"shard1/192.168.2.188:28011,192.168.2.132:28011,192.168.2.134:28011"});
>db.runCommand({addshard:"shard2/192.168.2.188:28012,192.168.2.132:28012,192.168.2.134:28012"});
db.settings.update({_id:\'chunksize\'},{$set:{value:1}})
#当所有配置设置成使用IP后，宕掉config server.
#再从本机尝试连接，发现不成功。
[mongo@localhost bin]$ ps -ef|grep mongod
mongo 4062 1 10 11:48 ? 00:09:56 /opt/mongodb3.0.3/bin/mongod --storageEngine wiredTiger -f shard1.conf
mongo 4082 1 8 11:48 ? 00:08:09 /opt/mongodb3.0.3/bin/mongod --storageEngine wiredTiger -f shard2.conf
mongo 4102 1 11 11:48 ? 00:10:45 /opt/mongodb3.0.3/bin/mongod --storageEngine wiredTiger -f configsvr.conf
mongo 4121 1 5 11:49 ? 00:04:55 /opt/mongodb3.0.3/bin/mongos --configdb 192.168.2.188:28010,192.168.2.132:28010,192.168.2.134:28010 --logpath /opt/mongodb3.0.3/logs/mongos.log --logappend --fork
root 9459 9420 0 13:23 pts/1 00:00:00 tail -330f /opt/mongodb3.0.3/logs/shard1.log
mongo 9471 2083 5 13:23 pts/0 00:00:00 grep mongod
[mongo@localhost bin]$ kill -9 4102
[mongo@localhost bin]$ ps -ef|grep mongod
mongo 4062 1 10 11:48 ? 00:10:20 /opt/mongodb3.0.3/bin/mongod --storageEngine wiredTiger -f shard1.conf
mongo 4082 1 8 11:48 ? 00:08:18 /opt/mongodb3.0.3/bin/mongod --storageEngine wiredTiger -f shard2.conf
mongo 4121 1 5 11:49 ? 00:04:59 /opt/mongodb3.0.3/bin/mongos --configdb 192.168.2.188:28010,192.168.2.132:28010,192.168.2.134:28010 --logpath /opt/mongodb3.0.3/logs/mongos.log --logappend --fork
root 9459 9420 0 13:23 pts/1 00:00:00 tail -330f /opt/mongodb3.0.3/logs/shard1.log
mongo 9488 2083 5 13:24 pts/0 00:00:00 grep mongod
[mongo@localhost bin]$ ./mongo -port 28000
MongoDB shell version: 3.0.3
connecting to: 127.0.0.1:28000/test
2015-07-31T13:25:52.166+0800 W NETWORK Failed to connect to 127.0.0.1:28000, reason: errno:111 Connection refused
2015-07-31T13:25:53.514+0800 E QUERY Error: couldn\'t connect to server 127.0.0.1:28000 (127.0.0.1), connection attempt failed
at connect (src/mongo/shell/mongo.js:181:14)
at (connect):1:6 at src/mongo/shell/mongo.js:181
exception: connect failed
[mongo@localhost bin]$ ./mongo -port 28000
MongoDB shell version: 3.0.3
connecting to: 127.0.0.1:28000/test
2015-07-31T13:26:30.823+0800 W NETWORK Failed to connect to 127.0.0.1:28000, reason: errno:111 Connection refused
2015-07-31T13:26:32.929+0800 E QUERY Error: couldn\'t connect to server 127.0.0.1:28000 (127.0.0.1), connection attempt failed
at connect (src/mongo/shell/mongo.js:181:14)
at (connect):1:6 at src/mongo/shell/mongo.js:181
exception: connect failed
[mongo@localhost bin]$ ps -ef|grep mongod
mongo 4062 1 12 11:48 ? 00:11:48 /opt/mongodb3.0.3/bin/mongod --storageEngine wiredTiger -f shard1.conf
mongo 4082 1 8 11:48 ? 00:08:29 /opt/mongodb3.0.3/bin/mongod --storageEngine wiredTiger -f shard2.conf
mongo 4121 1 5 11:49 ? 00:05:09 /opt/mongodb3.0.3/bin/mongos --configdb 192.168.2.188:28010,192.168.2.132:28010,192.168.2.134:28010 --logpath /opt/mongodb3.0.3/logs/mongos.log --logappend --fork
root 9459 9420 0 13:23 pts/1 00:00:00 tail -330f /opt/mongodb3.0.3/logs/shard1.log
mongo 9754 2083 7 13:26 pts/0 00:00:00 grep mongod
[mongo@localhost bin]$ ./mongo -port 28000
MongoDB shell version: 3.0.3
connecting to: 127.0.0.1:28000/test
2015-07-31T13:28:17.397+0800 W NETWORK Failed to connect to 127.0.0.1:28000, reason: errno:111 Connection refused
2015-07-31T13:28:19.161+0800 E QUERY Error: couldn\'t connect to server 127.0.0.1:28000 (127.0.0.1), connection attempt failed
at connect (src/mongo/shell/mongo.js:181:14)
at (connect):1:6 at src/mongo/shell/mongo.js:181
exception: connect failed
[mongo@localhost bin]$
#而其它节点（t2,t1）服务器连接没有问题。使用mongochef 测试，也印证了这点。
是否说使用Ip地址，真的是在服务器集群中，稳定性会差一些呢。
并且我同在宕掉config server. 时，测试循环插入数据的代码没有中止。后面也一直在插入数据。
[mongo@t2 bin]$ ./mongo -port 28000
MongoDB shell version: 3.0.3
connecting to: 127.0.0.1:28000/test
mongos>
connecting to: 127.0.0.1:28000/test
mongos> db.customer.count()
10024
mongos> db.customer.count()
10091
mongos> db.customer.count()
10103
mongos>
可以从下面的日志中看到这点：
2015-07-31T13:34:55.114+0800 I NETWORK [LockPinger] trying reconnect to 192.168.2.134:28010 (192.168.2.134) failed
2015-07-31T13:34:55.328+0800 W NETWORK [LockPinger] Failed to connect to 192.168.2.134:28010, reason: errno:111 Connection refused
2015-07-31T13:34:55.383+0800 I WRITE [conn258] insert test.customer query: { _id: 11119.0, name: " test name test name test name test name test name test name test name test name test name end", address: "address test customer al;dkjfa;lsdfjsal;#^end", province: "test customer province", city: "test customer city" } ninserted:1 keyUpdates:0 writeConflicts:0 numYields:0 locks:{ Global: { acquireCount: { w: 2 } }, Database: { acquireCount: { w: 2 } }, Collection: { acquireCount: { w: 1 } }, oplog: { acquireCount: { w: 1 } } } 115ms
2015-07-31T13:34:55.419+0800 I NETWORK [LockPinger] reconnect 192.168.2.134:28010 (192.168.2.134) failed failed couldn\'t connect to server 192.168.2.134:28010 (192.168.2.134), connection attempt failed
2015-07-31T13:34:55.556+0800 I COMMAND [conn258] command test.$cmd command: insert { insert: "customer", documents: [ { _id: 11119.0, name: " test name test name test name test name test name test name test name test name test name end", address: "address test customer al;dkjfa;lsdfjsal;#^end", province: "test customer province", city: "test customer city" } ], ordered: true, metadata: { shardName: "shard1", shardVersion: [ Timestamp 4000|1, ObjectId(\'55bb0603bb39501b3b7c2934\') ], session: 0 } } ntoreturn:1 keyUpdates:0 writeConflicts:0 numYields:0 reslen:140 locks:{ Global: { acquireCount: { w: 2 } }, Database: { acquireCount: { w: 2 } }, Collection: { acquireCount: { w: 1 } }, oplog: { acquireCount: { w: 1 } } } 312ms
2015-07-31T13:34:55.618+0800 I NETWORK [LockPinger] scoped connection to 192.168.2.188:28010,192.168.2.132:28010,192.168.2.134:28010 not being returned to the pool
2015-07-31T13:34:55.714+0800 W SHARDING [LockPinger] distributed lock pinger \'192.168.2.188:28010,192.168.2.132:28010,192.168.2.134:28010/t3:28011:1438320143:660128477\' detected an exception while pinging. :: caused by :: SyncClusterConnection::update prepare failed: 192.168.2.134:28010 (192.168.2.134) failed:9001 socket exception [CONNECT_ERROR] server [192.168.2.134:28010 (192.168.2.134) failed]
2015-07-31T13:34:55.773+0800 I COMMAND [conn258] command test.$cmd command: insert { insert: "customer", documents: [ { _id: 11120.0, name: " test name test name test name test name test name test name test name test name test name end", address: "address test customer al;dkjfa;lsdfjsal;#^end", province: "test customer province", city: "test customer city" } ], ordered: true, metadata: { shardName: "shard1", shardVersion: [ Timestamp 4000|1, ObjectId(\'55bb0603bb39501b3b7c2934\') ], session: 0 } } ntoreturn:1 keyUpdates:0 writeConflicts:0 numYields:0 reslen:140 locks:{ Global: { acquireCount: { w: 2 } }, Database: { acquireCount: { w: 2 } }, Collection: { acquireCount: { w: 1 } }, oplog: { acquireCount: { w: 1 } } } 105ms
2015-07-31T13:34:56.034+0800 I WRITE [conn258] insert test.customer query: { _id: 11121.0, name: " test name test name test name test name test name test name test name test name test name end", address: "address test customer al;dkjfa;lsdfjsal;#^end", province: "test customer province", city: "test customer city" } ninserted:1 keyUpdates:0 writeConflicts:0 numYields:0 locks:{ Global: { acquireCount: { w: 2 } }, Database: { acquireCount: { w: 2 } }, Collection: { acquireCount: { w: 1 } }, oplog: { acquireCount: { w: 1 } } } 114ms
2015-07-31T13:34:56.161+0800 I COMMAND [conn258] command test.$cmd command: insert { insert: "customer", documents: [ { _id: 11121.0, name: " test name test name test name test name test name test name test name test name test name end", address: "address test customer al;dkjfa;lsdfjsal;#^end", province: "test customer province", city: "test customer city" } ], ordered: true, metadata: { shardName: "shard1", shardVersion: [ Timestamp 4000|1, ObjectId(\'55bb0603bb39501b3b7c2934\') ], session: 0 } } ntoreturn:1 keyUpdates:0 writeConflicts:0 numYields:0 reslen:140 locks:{ Global: { acquireCount: { w: 2 } }, Database: { acquireCount: { w: 2 } }, Collection: { acquireCount: { w: 1 } }, oplog: { acquireCount: { w: 1 } } } 256ms
2015-07-31T13:34:56.367+0800 I COMMAND [conn258] command test.$cmd command: insert { insert: "customer", documents: [ { _id: 11122.0, name: " test name test name test name test name test name test name test name test name test name end", address: "address test customer al;dkjfa;lsdfjsal;#^end", province: "test customer province", city: "test customer city" } ], ordered: true, metadata: { shardName: "shard1", shardVersion: [ Timestamp 4000|1, ObjectId(\'55bb0603bb39501b3b7c2934\') ], session: 0 } } ntoreturn:1 keyUpdates:0 writeConflicts:0 numYields:0 reslen:140 locks:{ Global: { acquireCount: { w: 2 } }, Database: { acquireCount: { w: 2 } }, Collection: { acquireCount: { w: 1 } }, oplog: { acquireCount: { w: 1 } } } 110ms
#重启config 后，再登录也出错。
可能是本机mongos 已记录没找到config ，后再重启mongos ，全部正常。
这有点说不过去。
[mongo@localhost bin]$ ./configd_start.sh
about to fork child process, waiting until server is ready for connections.
forked process: 12102
child process started successfully, parent exiting
[mongo@localhost bin]$ ./mongo -port 28000
MongoDB shell version: 3.0.3
connecting to: 127.0.0.1:28000/test
2015-07-31T13:46:49.324+0800 W NETWORK Failed to connect to 127.0.0.1:28000, reason: errno:111 Connection refused
2015-07-31T13:46:50.747+0800 E QUERY Error: couldn\'t connect to server 127.0.0.1:28000 (127.0.0.1), connection attempt failed
at connect (src/mongo/shell/mongo.js:181:14)
at (connect):1:6 at src/mongo/shell/mongo.js:181
exception: connect failed
[mongo@localhost bin]$ ps -ef|grep mongod
mongo 4062 1 23 11:48 ? 00:27:18 /opt/mongodb3.0.3/bin/mongod --storageEngine wiredTiger -f shard1.conf
mongo 4082 1 8 11:48 ? 00:10:29 /opt/mongodb3.0.3/bin/mongod --storageEngine wiredTiger -f shard2.conf
mongo 4121 1 5 11:49 ? 00:06:56 /opt/mongodb3.0.3/bin/mongos --configdb 192.168.2.188:28010,192.168.2.132:28010,192.168.2.134:28010 --logpath /opt/mongodb3.0.3/logs/mongos.log --logappend --fork
root 11468 9420 0 13:40 pts/1 00:00:01 tail -330f /opt/mongodb3.0.3/logs/shard1.log
mongo 12102 1 12 13:46 ? 00:00:05 /opt/mongodb3.0.3/bin/mongod --storageEngine wiredTiger -f configsvr.conf
mongo 12190 2083 3 13:46 pts/0 00:00:00 grep mongod
[mongo@localhost bin]$ kill -9 4121
[mongo@localhost bin]$ ./mongos_router.sh
about to fork child process, waiting until server is ready for connections.
forked process: 12220
child process started successfully, parent exiting
[mongo@localhost bin]$ ps -ef|grep mongod
mongo 4062 1 23 11:48 ? 00:27:57 /opt/mongodb3.0.3/bin/mongod --storageEngine wiredTiger -f shard1.conf
mongo 4082 1 9 11:48 ? 00:11:09 /opt/mongodb3.0.3/bin/mongod --storageEngine wiredTiger -f shard2.conf
root 11468 9420 0 13:40 pts/1 00:00:01 tail -330f /opt/mongodb3.0.3/logs/shard1.log
mongo 12102 1 19 13:46 ? 00:00:31 /opt/mongodb3.0.3/bin/mongod --storageEngine wiredTiger -f configsvr.conf
mongo 12220 1 5 13:47 ? 00:00:04 /opt/mongodb3.0.3/bin/mongos --configdb 192.168.2.188:28010,192.168.2.132:28010,192.168.2.134:28010 --logpath /opt/mongodb3.0.3/logs/mongos.log --logappend --fork
mongo 12299 2083 3 13:48 pts/0 00:00:00 grep mongod
[mongo@localhost bin]$ ./mongo -port 28000
MongoDB shell version: 3.0.3
cfg = rs.conf()
cfg.members[0].priority = 2;
cfg.members[1].priority = 3;
cfg.members[2].priority = 1;
rs.reconfig(cfg);
网站题目：测试一个configserver服务器挂机后，集群是否能读写数据
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