Linux HA 部署

2023-03-15 19:35| 来源: 网络整理| 查看: 265

部署 Keepalived 及配置 VIP1 准备工作1.1 服务器准备1.2 软件准备2 安装 Keepalived3 配置系统服务4 编写 Keepalived 切换脚本5 配置 Keepalived5.1 配置 Keepalived-1 节点5.2 配置 Keepalived-2 节点6 启动 Keepalived 服务7 验证高可用配置部署 Keepalived 及配置 VIP1 准备工作1.1 服务器准备

此处在 MySQL 集群节点上进行 Keepalived 的安装，一起实现负载均衡和 MySQL 的高可用，节点规划如下：

Keepalived-1 节点，IP 为 10.1.11.187Keepalived-2 节点，IP 为 10.1.11.189

其他信息：

VIP：10.1.11.137 1.2 软件准备

可以在 Keepalived 官网下载对应的安装包，此处下载的是 keepalived-2.2.7.tar.gz。

wget --no-check-certificate https://www.keepalived.org/software/keepalived-2.2.7.tar.gz2 安装 Keepalived

在两个节点上分别执行以下命令安装 Keepalived：

# 安装依赖包yum install -y gcc-c++ pcre-devel openssl-devel popt-devel gcc automake autoconf libtool make ca-certificatestar zxvf keepalived-2.2.7.tar.gz -C /optcd /opt/keepalived-2.2.7./configure --prefix=/usr/local/keepalivedmake && make install3 配置系统服务

在两个节点上分别执行以下命令：

cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/keepalivedcp /usr/local/keepalived/sbin/keepalived /usr/sbin/keepalivedcp /opt/keepalived-2.2.7/keepalived/etc/init.d/keepalived /etc/init.d/keepalivedmkdir -p /etc/keepalived

加为系统服务且开机自启动：

chkconfig --add keepalivedchkconfig keepalived on4 编写 Keepalived 切换脚本

在两个节点上执行以下命令创建 Keepalived 切换脚本：

cat /usr/local/keepalived/down.sh#!/bin/bashpkill keepalivedEOF# 赋予切换脚本执行权限chmod +x /usr/local/keepalived/down.sh5 配置 Keepalived5.1 配置 Keepalived-1 节点

将 Keepalived-1 上的 Keepalived 配置文件 /etc/keepalived/keepalived.conf 修改为以下内容：

! Configuration File for keepalivedglobal_defs { router_id DE_HA}vrrp_instance VI_1 { state MASTER interface ens192 virtual_router_id 51 priority 100 advert_int 1 #本机 ip unicast_src_ip 10.1.11.187 unicast_peer { #对端 ip 10.1.11.189} authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 10.1.11.137 }}virtual_server 10.1.11.137 3306 { delay_loop 2 persistence_timeout 50 protocol TCP real_server 10.1.11.187 3306 { weight 3 notify_down /usr/local/keepalived/down.sh TCP_CHECK { connect_timeout 3 nb_get_retry 3 delay_before_retry 3 } }}virtual_server 10.1.11.137 80 { delay_loop 2 persistence_timeout 50 protocol TCP real_server 10.1.11.187 80 { weight 3 notify_down /usr/local/keepalived/down.sh TCP_CHECK { connect_timeout 3 nb_get_retry 3 delay_before_retry 3 } }}

注意：

配置文件中的 “interface ens192”，需要视具体环境设置对应的网卡，如 “eth0” 等；注意配置文件中的 “state MASTER”、”priority 100”。 5.2 配置 Keepalived-2 节点

将 Keepalived-2 节点上的 Keepalived 配置文件 /etc/keepalived/keepalived.conf 修改为以下内容：

! Configuration File for keepalivedglobal_defs { router_id DE_HA}vrrp_instance VI_1 { state BACKUP interface ens192 virtual_router_id 51 priority 50 advert_int 1 #本机ip unicast_src_ip 10.1.11.189 unicast_peer { #对端ip 10.1.11.187 } authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 10.1.11.137 }}virtual_server 10.1.11.137 3306 { delay_loop 2 persistence_timeout 50 protocol TCP real_server 10.1.11.189 3306 { weight 3 notify_down /usr/local/keepalived/down.sh TCP_CHECK { connect_timeout 3 nb_get_retry 3 delay_before_retry 3 } }}virtual_server 10.1.11.137 80 { delay_loop 2 persistence_timeout 50 protocol TCP real_server 10.1.11.189 80 { weight 3 notify_down /usr/local/keepalived/down.sh TCP_CHECK { connect_timeout 3 nb_get_retry 3 delay_before_retry 3 } }}

注意：

配置文件中的 “interface eth0”，需要视具体环境设置对应的网卡，如 “ens192” 等；注意配置文件中的 “state BACKUP”、”priority 50”。 6 启动 Keepalived 服务

在两个节点上分别启动 Keepalived 服务：

service keepalived start

7 验证高可用配置

Keepalived 配置的 MASTER 节点为 Keepalived-1 节点，可以通过在两个节点上执行命令，查看配置的 VIP 在哪台机器上。

ip addr

在 Keepalived-1 节点上可以看到对应的网卡上存在两个 IP，分别是自身 IP 10.1.11.187 和 VIP 10.1.11.137。

而 Keepalived-2 节点上只会看到 IP 10.1.11.189。

当在 Keepalived-1 节点上关闭 Nginx 服务后，再次执行上述命令，可以看到 Keepalived-2 节点上存在两个 IP，VIP 已经漂移到了 Keepalived-2 节点上。

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Linux HA 部署

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