HAC集群添加新节点
1、查看集群状态，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、新增节点安装数据库，hghac软件
rpm -ivh hgdb4.5.7-see-centos7-x86-64-20220307.rpm
rpm -ivh hghac4.0.1-centos7-x86-64-20210604.rpm
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3、将主节点环境变量复制到新增节点，并使环境变量生效
vim ~/.bash_profile
source ~/.bash_profile
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4、新增节点执行如下命令将主库hghac-see.yaml复制到本机
scp /opt/HighGo/tools/hghac root@192.168.80.228:/opt/HighGo/tools/hghac/hghac-see.yaml
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5、新增节点修改hghac-see.yaml文件
vim /opt/HighGo/tools/hghac/hghac-see.yaml
connect_address: 192.168.80.228:8008 #将ip修改为本机ip,例：192.168.80.230:8008
name: hghac228 #修改为hghac+本机ip最后一位，例：hghac230
connect_address: 192.168.80.228:5866 #将ip修改为本机ip,例：192.168.80.230:5866
data_dir: /hgdata/highgo/data #查看/hgdata/highgo目录是否存在，
#不存在mkdir -p /hgdata/highgo创建，/hgdata目录应该是挂载的磁盘目录
dir: /hgdata/hghalog #查看该目录是否存在，不存在mkdir -p /hgdata/hghalog 创建
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6、新增节点设置集群服务开机自启动，并启动集群服务器和禁用数据库服务
[root@hgdw231 hgupload]# systemctl enable hghac.service
Created symlink from /etc/systemd/system/multi-user.target.wants/hghac.service to /etc/systemd/system/hghac.service.
[root@hgdw231 hgupload]# systemctl start hghac.service
[root@hgdw231 hgupload]# systemctl disable hgdb-see-4.5.7.service
Removed symlink /etc/systemd/system/multi-user.target.wants/hgdb-see-4.5.7.service.
Removed symlink /etc/systemd/system/graphical.target.wants/hgdb-see-4.5.7.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
7、检查集群状态
[root@localhost ~]# hghactl list
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8、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
