Docker方式创建keepalived连接MGR集群

docker pull osixia/keepalived:2.0.20

docker run --name keepalivedtest --cap-add=NET_ADMIN --cap-add=NET_BROADCAST --cap-add=NET_RAW -e KEEPALIVED_INTERFACE=enp6s0 --net=host -d osixia/keepalived:2.0.20

docker exec -it keepalivedtest /bin/bash

apk add mysql mysql-client
...稍等片刻
...
安装完成后
退出容器 exit

docker commit keepalivedtest  mgr_keepalived:2.0.20

 docker save -o mgr_keepalived2.tar mgr_keepalived:2.0.20

docker load -i mgr_keepalived2.tar

#!/bin/bash

# 替换以下变量为你的实际MySQL用户、密码和端口
MYSQL_USER="rpl_user"
MYSQL_PASS="请填写账号密码"
MYSQL_PORT="请填写端口号"
MYSQL_HOST="请填写节点主机IP"

# 检查MySQL服务是否运行
if nc -z "$MYSQL_HOST" "$MYSQL_PORT"; then
    echo "MySQL 服务在 $MYSQL_HOST:$MYSQL_PORT 上正在运行"
else
    echo "MySQL 服务在 $MYSQL_HOST:$MYSQL_PORT 上未运行"
    exit 1
fi

# 检查当前节点是否为主节点
IS_READONLY=$(mysql -u"$MYSQL_USER" -p"$MYSQL_PASS" -P"$MYSQL_PORT" -h"$MYSQL_HOST" -e "SHOW GLOBAL VARIABLES LIKE 'read_only';" | grep -c "ON")

if [[ $IS_READONLY -ne 0 ]]; then
    echo "当前节点为只读状态，判定为从节点"
    exit 1
fi

# 获取当前主机名并存储在变量中
CURRENT_HOST=$(hostname)

IS_MASTER=$(mysql -u"$MYSQL_USER" -p"$MYSQL_PASS" -P"$MYSQL_PORT" -h"$MYSQL_HOST" -e "
SELECT COUNT(1)
FROM performance_schema.replication_group_members
WHERE MEMBER_HOST ='$CURRENT_HOST'
AND MEMBER_STATE = 'ONLINE'
AND MEMBER_ROLE='PRIMARY';" | tail -n 1)

if [[ $IS_MASTER -eq 0 ]]; then
    echo "当前节点是从节点"
    exit 1
else
    echo "当前节点是主节点"
    exit 0
fi

vrrp_script chk_mysql {
    script "/usr/local/bin/mysql_master_check.sh"
    interval 2
    weight -5
    fall 2
    rise 1
}

vrrp_instance VI_1 {
    state MASTER
    interface enp6s0
    virtual_router_id 51
    priority 101
    advert_int 1  
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.1.110
    }
    track_script {
        chk_mysql
    }
}

docker run -d --name mgr8keepalived \
	--cap-add=NET_ADMIN \
	--cap-add=NET_BROADCAST \
	--cap-add=NET_RAW \
	--net=host \
	-e KEEPALIVED_INTERFACE=enp6s0 \
	-v /apps/keepalived/keepalived.conf:/container/service/keepalived/assets/keepalived.conf \
	-v /apps/keepalived/mysql_master_check.sh:/usr/local/bin/mysql_master_check.sh \
	mgr_keepalived:2.0.20 --loglevel debug --copy-service

...
Wed Jan 31 09:32:53 2024:    Reset ARP config counter 0
Wed Jan 31 09:32:53 2024:    Original arp_ignore 0
Wed Jan 31 09:32:53 2024:    Original arp_filter 0
Wed Jan 31 09:32:53 2024:    Original promote_secondaries 1
Wed Jan 31 09:32:53 2024:    Reset promote_secondaries counter 0
Wed Jan 31 09:32:53 2024:    Tracking VRRP instances = 0
Wed Jan 31 09:32:53 2024: (VI_1) Entering BACKUP STATE (init)
Wed Jan 31 09:32:53 2024: VRRP sockpool: [ifindex(2), family(IPv4), proto(112), unicast(0), fd(11,12)]
Wed Jan 31 09:32:53 2024: VRRP_Script(chk_mysql) succeeded
Wed Jan 31 09:32:53 2024: (VI_1) Changing effective priority from 101 to 103
Wed Jan 31 09:32:57 2024: (VI_1) Receive advertisement timeout
Wed Jan 31 09:32:57 2024: (VI_1) Entering MASTER STATE
Wed Jan 31 09:32:57 2024: (VI_1) setting VIPs.
Wed Jan 31 09:32:57 2024: Sending gratuitous ARP on enp6s0 for 192.168.1.110
Wed Jan 31 09:32:57 2024: (VI_1) Sending/queueing gratuitous ARPs on enp6s0 for 192.168.1.110
Wed Jan 31 09:32:57 2024: Sending gratuitous ARP on enp6s0 for 192.168.1.110
Wed Jan 31 09:32:57 2024: Sending gratuitous ARP on enp6s0 for 192.168.1.110
...