HAC cluster is modified to stand-alone

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Environmental Science
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Environmental Science
system platform ：Linux x86 Red Hat Enterprise Linux 6
edition ：4.5.7
Document purpose
This document is used to guide HAC Cluster is modified to stand-alone

Details
1、 Check cluster status , Use A、B There are two ways to judge

Method A： Use the cluster command , Make sure TL The timeline is consistent ,Lag in MB The data synchronization delay should not be too high , The best delay is 0.

[[email protected] ~]# hghactl list

+ Cluster: ha (7072256965608815760) -------+---------+----+-----------+

| Member   | Host                | Role    | State   | TL | Lag in MB |

+----------+---------------------+---------+---------+----+-----------+

| hghac228 | 192.168.80.228:5866 | Leader  | running |  6 |           |

| hghac230 | 192.168.80.230:5866 | Replica | running |  6 |         0 |

+----------+---------------------+---------+---------+----+-----------+

Method B： Each node queries the process , Yes sender The node is the main library , Yes receiver The node is a standby database

ps -ef | grep sender

root     26418  3233  0 6 month 11 ?    00:00:22 postgres: c: walsender sysdba 192.168.80.228(45186) streaming 0/16000000

ps -ef | grep receiver

root      3372  3348  0 6 month 11 ?     00:13:54 postgres: c: walreceiver   streaming 0/16000000

2、 Other nodes of the cluster that are not stand-alone nodes stop 、 Ban hghac service

[[email protected] hgupload]# systemctl stop hghac.service

[[email protected] hgupload]# systemctl disable hghac.service

Removed symlink /etc/systemd/system/multi-user.target.wants/hghac.service.

 Be careful ：

 Maybe not hghac.service, May be hghac-vip.service  Please use systemctl status hghac.service/hghac-vip.service Determine which services are running 

3、 The database modified as a stand-alone node stops 、 Ban hghac service , And set the database service to start automatically

[[email protected] hgupload]# systemctl stop hghac.service

[[email protected] hgupload]# systemctl disable hghac.service

Removed symlink /etc/systemd/system/multi-user.target.wants/hghac.service.

[[email protected] etc]# systemctl enable hgdb-see-4.5.7.service

4、 Modify the database as a stand-alone node, and check whether the database service starts automatically , And start the database

[[email protected] etc]# systemctl status hgdb-see-4.5.7.service

● hgdb-see-4.5.7.service - highgodb-4.5.7

   Loaded: loaded (/usr/lib/systemd/system/hgdb-see-4.5.7.service; enabled; vendor preset: disabled)

   Active: inactive (dead)

[[email protected] etc]# pg_ctl start

 Wait for the server process to start  ....2022-04-19 14:33:53 CST [21906]: [1-1] 625e57d1.5592 0      journal :  data encryption performed by sm4

2022-04-19 14:33:53 CST [21906]: [2-1] 625e57d1.5592 0      journal :  Password detection module is disabled

2022-04-19 14:33:53 CST [21906]: [3-1] 625e57d1.5592 0      journal :   Starting  HighGo Security Enterprise Edition Database System 4.5.7 on CentOS7 x86_64,build on 20220302

2022-04-19 14:33:53 CST [21906]: [4-1] 625e57d1.5592 0      journal :   Monitoring IPv4 Address "0.0.0.0", port  5866

2022-04-19 14:33:53 CST [21906]: [5-1] 625e57d1.5592 0      journal :   Monitoring IPv6 Address "::", port  5866

2022-04-19 14:33:53 CST [21906]: [6-1] 625e57d1.5592 0      journal :   stay Unix Socket  "/tmp/.s.PGSQL.5866" Listen on 

2022-04-19 14:33:53 CST [21906]: [7-1] 625e57d1.5592 0      journal :   Redirect log output to the log collection process 

2022-04-19 14:33:53 CST [21906]: [8-1] 625e57d1.5592 0      Tips :   Subsequent log output will appear in the directory  "hgdb_log" in .

  complete 

 The server process has started 

5、 Stop and disable all nodes etcd service

systemctl stop etcd.service

systemctl disable etcd.service

6、 other

perform hghactl Wait for the cluster command prompt “ Command not found ”, Please configure the environment variable , Refer to the following ：

vim ~/.bash_profile

 

export PGPORT=5866

export PGUSER=sysdba

export PGDATABASE=highgo

export PGHOME=/opt/HighGo4.5.7-see

export PGDATA=/opt/HighGo4.5.7-see/data

export PATH=$PGHOME/bin:$PATH:$HOME/bin:/opt/HighGo/tools/hghac:/opt/HighGo/tools/hghac/etcd

export LD_LIBRARY_PATH=$PGHOME/lib:/usr/lib64:$LD_LIBRARY_PATH

export ETCDCTL_ENDPOINTS=http://10.1.194.182:2379,http://10.1.194.191:2379,http://10.1.194.192:2379

export PATRONICTL_CONFIG_FILE=/opt/HighGo/tools/hghac/hghac-see.yaml

 

source ~/.bash_profile



 Be careful ：

1、 You need to modify the actual path of environment variables according to the actual situation , have access to find Command to find the file path 

 example ： lookup hghac   find / -iname hghac -print

2、ETCDCTL_ENDPOINTS Three ip It needs to be modified to configuration etcd Three node ip, You can refer to /opt/HighGo/tools/hghac/hghac-see.yaml In the document etcd:hosts