HAC集群添加新节点

瀚高数据库

目录

环境

文档用途

详细信息

环境

系统平台:Linux x86-64 Red Hat Enterprise Linux 7

版本:4.5.7,4.5.6

文档用途

本文档用于指导HAC集群添加新节点

详细信息

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 |
+----------+---------------------+---------+---------+----+-----------+

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

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

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

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

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

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.

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

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


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

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