MongoDB replication set Management (subsequent)
Brief introduction:
Replication set:
1: standard node:
Participate in the primary election
2: passive node:
Can only become a secend and do not participate in the election.
3: arbitration node:
Responsible for voting, no data storage
Experimental environment: 2 standard nodes, 1 passive node and 1 arbitration point
Specific experimental steps: (the first half of the experiment is the operation of the last experiment)
[root@localhost] # mkdir-p / data/mongodb/mongodb {2pm 3pm 4}
[root@localhost] # mkdir-p / data/mongodb/logs
[root@localhost ~] # touch / data/mongodb/logs/mongodb {2pm 3pm 4} .log
[root@localhost ~] # chmod 777 / data/mongodb/logs/*.log
Edit configuration file
[root@localhost logs] # vim / etc/mongod.conf
Enable replication and customize the name.
Replication:
ReplSetName: kgcrs
[root@localhost yum.repos.d] # mongod-f / etc/mongod.conf-- shutdown # disable the service
[root@localhost yum.repos.d] # mongod-f / etc/mongod.conf # enable the service
Replication produces four instances
[root@localhost yum.repos.d] # cp-p / etc/mongod.conf / etc/mongod2.conf
[root@localhost yum.repos.d] # cp-p / etc/mongod.conf / etc/mongod3.conf
[root@localhost yum.repos.d] # cp-p / etc/mongod.conf / etc/mongod4.conf
[root@localhost yum.repos.d] # vim / etc/mongod2.conf
# three modifications
Path: / data/mongodb/logs/mongodb2.log
DbPath: / data/mongodb/mongodb2
Port: 27018
# modify the other several
[root@localhost yum.repos.d] # cp-p / etc/mongod2.conf / etc/mongod3.conf
[root@localhost yum.repos.d] # vim / etc/mongod3.conf
(the same three, just change the serial number.)
[root@localhost yum.repos.d] # cp-p / etc/mongod2.conf / etc/mongod4.conf
[root@localhost yum.repos.d] # vim / etc/mongod4.conf
# start after the modification is completed
[root@localhost yum.repos.d] # mongod-f / etc/mongod2.conf
[root@localhost yum.repos.d] # mongod-f / etc/mongod3.conf
[root@localhost yum.repos.d] # mongod-f / etc/mongod4.conf
# View port enabled
[root@localhost yum.repos.d] # netstat-ntap
# Log in to MongoDB
# replication set
Cfg= {"_ id": "kgcrs", "members": [{"_ id": 0, "host": "192.168.120.136kgcrs 27017", "priority": 100}, {"_ id": 1, "host": "192.168.120.136kgcrs 27018", "priority": 100}, {"_ id": 2, "host": "192.168.120.136 kgcrs 27019", "priority": 0}, {"_ id": 3 "host": "192.168.120.136 true 27020", "arbiterOnly": true}]}
{
"_ id": "kgcrs"
"members": [
{
"_ id": 0
"host": "192.168.120.136 purl 27017"
"priority":
}
{
"_ id": 1
"host": "192.168.120.136 purl 27018"
"priority":
}
{
"_ id": 2
"host": "192.168.120.136 purl 27019"
"priority": 0
}
{
"_ id": 3
"host": "192.168.120.136 purl 27020"
"arbiterOnly": true
}
]
}
# initialization
Rs.initiate (cfg)
{
"ok": 1
OperationTime: Timestamp (1536821356, 1)
"$clusterTime": {
ClusterTime: Timestamp (1536821356, 1)
"signature": {
"hash": BinData (0, "AAAAAAAAAAAAAAAAAAAAAAAAAAA=")
"keyId": NumberLong (0)
}
}
}
# check identity
Kgcrs:PRIMARY > rs.isMaster ()
{
"hosts": [
"192.168.120.136purl 27017"
"192.168.120.136purl 27018"
]
"passives": [
"192.168.120.136purl 27019"
]
"arbiters": [
"192.168.120.136purl 27020"
]
"setName": "kgcrs"
"setVersion": 1
"ismaster": true
"secondary": false
"primary": "192.168.120.136 purl 27017"
"me": "192.168.120.136 purl 27017"
"electionId": ObjectId ("7fffffff0000000000000001")
"lastWrite": {
"opTime": {
Ts: Timestamp (1536821508, 1)
"t": NumberLong (1)
}
LastWriteDate: ISODate ("2018-09-13T06:51:48Z")
"majorityOpTime": {
Ts: Timestamp (1536821508, 1)
"t": NumberLong (1)
}
MajorityWriteDate: ISODate ("2018-09-13T06:51:48Z")
}
"maxBsonObjectSize": 16777216
"maxMessageSizeBytes": 48000000
"maxWriteBatchSize": 100000
LocalTime: ISODate ("2018-09-13T06:51:54.761Z")
"logicalSessionTimeoutMinutes": 30
"minWireVersion": 0
"maxWireVersion": 6
"readOnly": false
"ok": 1
OperationTime: Timestamp (1536821508, 1)
"$clusterTime": {
ClusterTime: Timestamp (1536821508, 1)
"signature": {
"hash": BinData (0, "AAAAAAAAAAAAAAAAAAAAAAAAAAA=")
"keyId": NumberLong (0)
}
}
}
-- log operations--
# create the library kgc and enter kgc
Kgcrs:PRIMARY > use kgc
Switched to db kgc
Create a T1 collection in the kgc library and insert two pieces of information
Kgcrs:PRIMARY > db.t1.insert ({"id": 1, "name": "jack"})
WriteResult ({"nInserted": 1})
Kgcrs:PRIMARY > db.t1.insert ({"id": 2, "name": "tom"})
WriteResult ({"nInserted": 1})
# View data
Kgcrs:PRIMARY > db.t1.find ()
{"_ id": ObjectId ("5b9a0d9efa7413d9cb629b39"), "id": 1, "name": "jack"}
{"_ id": ObjectId ("5b9a0dacfa7413d9cb629b3a"), "id": 2, "name": "tom"}
# after the database operation, we start the log operation
# enter local
Kgcrs:PRIMARY > use local
Switched to db local
# View the collection
Kgcrs:PRIMARY > show collections
Me
Oplog.rs
Replset.election
Replset.minvalid
Startup_log
System.replset
System.rollback.id
# View log files
Kgcrs:PRIMARY > db.oplog.rs.find ()
(all actions are recorded in this log)
# We all know that the master node can operate, and the slave node can only act as a replication set (not operable), so it cannot be viewed, but there is a command to view it.
# after logging in to the slave node, I found that I could not view it.
Kgcrs:SECONDARY > show dbs
2018-09-13T15:28:51.529+0800 E QUERY [thread1] Error: listDatabases failed: {
OperationTime: Timestamp (1536823728, 1)
"ok": 0
"errmsg": "not master and slaveOk=false"
"code": 13435
"codeName": "NotMasterNoSlaveOk"
"$clusterTime": {
ClusterTime: Timestamp (1536823728, 1)
"signature": {
"hash": BinData (0, "AAAAAAAAAAAAAAAAAAAAAAAAAAA=")
"keyId": NumberLong (0)
}
}
}: _ getErrorWithCode@src/mongo/shell/utils.js:25:13br/ > _ getErrorWithCode@src/mongo/shell/utils.js:25:13
Br/ > shellHelper.show@src/mongo/shell/utils.js:849:19
Br/ > @ (shellhelp2): 1:1
Kgcrs:SECONDARY > rs.slaveOk ()
# check it out (OK)
Kgcrs:SECONDARY > show dbs
Admin 0.000GB
Config 0.000GB
Kgc 0.000GB
# I can't remember the command. You can check the help.
Kgcrs:SECONDARY > rs.help ()
# View log time and size
Kgcrs:SECONDARY > rs.printReplicationInfo ()
Configured oplog size: 990MB
Log length start to end: 2812secs (0.78hrs)
Oplog first event time Thu Sep 13 2018 14:49:16 GMT+0800 (CST)
Oplog last event time Thu Sep 13 2018 15:36:08 GMT+0800 (CST)
Now Thu Sep 13 2018 15:36:12 GMT+0800 (CST)
# View node and replication time
Kgcrs:SECONDARY > rs.printSlaveReplicationInfo ()
Source: 192.168.120.136:27018
SyncedTo Thu Sep 13 2018 15:40:28 GMT+0800 (CST)
0 secs (0 hrs) behind the primary
Source: 192.168.120.136:27019
SyncedTo Thu Sep 13 2018 15:40:28 GMT+0800 (CST)
0 secs (0 hrs) behind the primary
# resize log files (offline upgrade)
# enter admin first
Kgcrs:SECONDARY > use admin
Switched to db admin
# disable the service
Kgcrs:SECONDARY > db.shutdownServer ()
Server should be down...
# Log out the startup parameters related to Replia set, and modify the port number to 27028
# enter the configuration file
[root@localhost ~] # vim / etc/mongod2.conf
# replication:
# replSetName: kgcrs comments out these two items first (exit the replication set)
Change port 27018 to 27028
# restart the service
[root@localhost] # mongod-f / etc/mongod2.conf
# complete all oplog records of the current node
[root@localhost] # mongodump-- port 27028-- db local-- collection 'oplog.rs'
2018-09-13T16:01:34.259+0800 writing local.oplog.rs to
2018-09-13T16:01:34.280+0800 done dumping local.oplog.rs (347documents)
[root@localhost] # mongo-- port 27028
Use local
Switched to db local
# delete the original
Db.oplog.rs.drop ()
True
# create a new one and set the size (2048m)
Db.runCommand ({create: "oplog.rs", capped:true,size: (210241024 / 1024)})
{"ok": 1}
# disable the service
Use admin
Switched to db admin
Db.shutdownServer ()
# reenter configuration file
[root@localhost ~] # vim / etc/mongod2.conf
# remove comments and add size
Replication:
ReplSetName: kgcrs
OplogSizeMB: 2048
# change the port back to 27018
# enable the service
[root@localhost] # mongod-f / etc/mongod2.conf
# enter 27018
# View size
Kgcrs:SECONDARY > rs.printReplicationInfo ()
Configured oplog size: 2048MB
Log length start to end: 100secs (0.03hrs)
Oplog first event time Thu Sep 13 2018 16:10:29 GMT+0800 (CST)
Oplog last event time Thu Sep 13 2018 16:12:09 GMT+0800 (CST)
Now Thu Sep 13 2018 16:12:16 GMT+0800 (CST)
-- deploy certified replication-
# j enter the primary node
Kgcrs:PRIMARY > use admin
Switched to db admin
# create a user-set password
Kgcrs:PRIMARY > db.createUser ({"user": "root", "pwd": "123"," roles ": [" root "]})
Successfully added user: {"user": "root", "roles": ["root"]}
# Editing configuration file
[root@localhost ~] # vim / etc/mongod.conf
# Open security and add two statements
Security:
KeyFile: / usr/bin/kgcrskeyl
ClusterAuthMode: keyFile
# modify the following synchronization operations ()
[root@localhost ~] # vim / etc/mongod2.conf
Security:
KeyFile: / usr/bin/kgcrskey2
ClusterAuthMode: keyFile
[root@localhost ~] # vim / etc/mongod3.conf
Security:
KeyFile: / usr/bin/kgcrskey3
ClusterAuthMode: keyFile
[root@localhost ~] # vim / etc/mongod4.conf
Security:
KeyFile: / usr/bin/kgcrskey4
ClusterAuthMode: keyFile
# write
[root@localhost ~] # cd / usr/bin/
[root@localhost bin] # echo "kgcrskey" > kgcrskey1
[root@localhost bin] # echo "kgcrskey" > kgcrskey2
[root@localhost bin] # echo "kgcrskey" > kgcrskey4
[root@localhost bin] # echo "kgcrskey" > kgcrskey3
[root@localhost bin] # mongod-f / etc/mongod.conf-- shutdown
Killing process with pid: 50970
[root@localhost bin] # chmod 600 kgc*
[root@localhost bin] # mongod-f / etc/mongod.conf
# restart four nodes in turn
# enter primary
Kgcrs:PRIMARY > show dbs # cannot view the database
Kgcrs:PRIMARY > rs.status () # unable to view replication set
Kgcrs:PRIMARY > use admin # authentication login
Kgcrs:PRIMARY > db.auth ("root", "123")
# Log in successfully. You can check
