HAC集群修改为单机
1、检查集群状态，使用A、B两种方法进行判断
方法A：使用集群命令，确保TL时间线一致，Lag in MB数据同步延迟不能过高，最好延迟为0。
[root@localhost ~]# 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 |
+----------+---------------------+---------+---------+----+-----------+
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方法B：各个节点查询进程，有sender节点的是主库，有receiver节点的是备库
ps -ef | grep sender
root 26418 3233 0 6月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月11 ? 00:13:54 postgres: c: walreceiver streaming 0/16000000
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2、不作为单机节点的集群其他各个节点停止、禁用hghac服务
[root@hgdw231 hgupload]# systemctl stop hghac.service
[root@hgdw231 hgupload]# systemctl disable hghac.service
Removed symlink /etc/systemd/system/multi-user.target.wants/hghac.service.
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注意：
也有可能不是hghac.service,可能是hghac-vip.service 请使用systemctl status hghac.service/hghac-vip.service确定运行的服务
3、修改为单机节点的数据库停止、禁用hghac服务，并设置数据库服务开机自启动
[root@hgdw231 hgupload]# systemctl stop hghac.service
[root@hgdw231 hgupload]# systemctl disable hghac.service
Removed symlink /etc/systemd/system/multi-user.target.wants/hghac.service.
[root@hgdw231 etc]# systemctl enable hgdb-see-4.5.7.service
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4、修改为单机节点的数据库检查数据库服务是否开机自启动，并启动数据库
[root@hgdw231 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)
[root@hgdw231 etc]# pg_ctl start
等待服务器进程启动 ....2022-04-19 14:33:53 CST [21906]: [1-1] 625e57d1.5592 0 日志: data encryption performed by sm4
2022-04-19 14:33:53 CST [21906]: [2-1] 625e57d1.5592 0 日志: Password detection module is disabled
2022-04-19 14:33:53 CST [21906]: [3-1] 625e57d1.5592 0 日志: 正在启动 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 日志: 正在监听IPv4地址"0.0.0.0"，端口 5866
2022-04-19 14:33:53 CST [21906]: [5-1] 625e57d1.5592 0 日志: 正在监听IPv6地址"::"，端口 5866
2022-04-19 14:33:53 CST [21906]: [6-1] 625e57d1.5592 0 日志: 在Unix套接字 "/tmp/.s.PGSQL.5866"上侦听
2022-04-19 14:33:53 CST [21906]: [7-1] 625e57d1.5592 0 日志: 日志输出重定向到日志收集进程
2022-04-19 14:33:53 CST [21906]: [8-1] 625e57d1.5592 0 提示: 后续的日志输出将出现在目录 "hgdb_log"中.
完成
服务器进程已经启动
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5、所有节点停掉并禁用etcd服务
systemctl stop etcd.service
systemctl disable etcd.service
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6、其他
执行hghactl等集群命令提示“未找到命令”，请配置环境变量，参考如下：
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
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注意：
1、需要根据实际情况修改环境变量实际路径，可以使用find命令查找文件路径
例：查找hghac find / -iname hghac -print
2、ETCDCTL_ENDPOINTS三个ip需要修改为配置etcd三节点的ip，可以参考/opt/HighGo/tools/hghac/hghac-see.yaml文件中的etcd:hosts
