259 lines
6.7 KiB
Markdown
259 lines
6.7 KiB
Markdown
---
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title: "Keepalived 笔记"
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date: 2019-10-30T11:22:03+08:00
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lastmod: 2019-10-30T11:22:03+08:00
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tags: ["keepalived", "高可用", "负载均衡"]
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categories: ["ha/lb"]
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---
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## keepalive 服务器
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- 环境
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- 应用服务器
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- ka101: 10.1.1.101
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- ka102: 10.1.1.102
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- 虚拟地址
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- ip: 10.1.1.100
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- 安装 keepalived
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```bash
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yum install keepalived
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```
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- 配置虚拟 ip
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```bash
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echo "1" >/proc/sys/net/ipv4/conf/lo/arp_ignore
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echo "2" >/proc/sys/net/ipv4/conf/lo/arp_announce
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echo "1" >/proc/sys/net/ipv4/conf/all/arp_ignore
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echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce
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ip addr add 10.1.1.100/32 brd 10.1.1.100 dev lo
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ip route add 10.1.1.100 dev lo
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```
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## 两个 haproxy 不抢占
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- MASTER/BACKUP 完整配置
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```
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global_defs {
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router_id ka101 #BACKUP 这里是 ka102
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script_user root
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enable_script_security
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}
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vrrp_script chk_haproxy {
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script "/usr/bin/systemctl status haproxy"
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interval 2
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weight 0
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fall 2
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rise 2
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}
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vrrp_instance VI_1 {
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state BACKUP #MASTER 和 BACKUP 这里都是 BACKUP
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virtual_router_id 1
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priority 150 #BACKUP 这里是 100
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advert_int 2
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nopreempt #BACKUP 优先级低，需注释此行
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interface eth0
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track_script {
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chk_haproxy
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}
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authentication {
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auth_type PASS
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auth_pass 1011100
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}
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virtual_ipaddress {
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10.1.1.100/24 dev eth0
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}
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}
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```
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## 两个 LVS-DR 调度器不抢占均衡后端 MySQL 和 Ceph 负载
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- 环境
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- mysqld 服务器
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- mysql103: 10.1.1.103
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- mysql104: 10.1.1.104
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- mysql105: 10.1.1.105
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- ceph-radosgw 服务器
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- ceph106: 10.1.1.106
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- ceph107: 10.1.1.107
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- ceph108: 10.1.1.108
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- MASTER/BACKUP 完整配置
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- 全局和实例配置
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```
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global_defs {
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router_id ka101 #BACKUP 配置 ka102
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}
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vrrp_instance V1_1 {
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state BACKUP #BACKUP 也配置 BACKUP
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interface eth0
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virtual_router_id 1
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priority 150 #BACKUP 配置 100
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advert_int 1
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nopreempt #BACKUP 优先级低，需注释此行
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authentication {
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auth_type PASS
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auth_pass 1011100
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}
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virtual_ipaddress {
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10.1.1.100/24 dev eth0
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}
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}
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```
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- LVS 均衡 mysql galera cluser 负载
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```
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virtual_server 10.1.1.100 3306 {
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delay_loop 16
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lb_algo sh
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lb_kind DR
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protocol TCP
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real_server 10.1.1.103 3306 {
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weight 1
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TCP_CHECK {
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connect_timeout 4
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delay_before_retry 2
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connect_port 3306
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}
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}
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real_server 10.1.1.104 3306 {
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weight 1
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TCP_CHECK {
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connect_timeout 4
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delay_before_retry 2
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connect_port 3306
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}
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}
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real_server 10.1.1.105 3306 {
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weight 1
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TCP_CHECK {
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connect_timeout 4
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delay_before_retry 2
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connect_port 3306
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}
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}
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}
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```
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- LVS 均衡 ceph radosgw 负载
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```
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virtual_server 10.1.1.100 7480 {
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delay_loop 16
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lb_algo sh
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lb_kind DR
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protocol TCP
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real_server 10.1.1.106 7480 {
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weight 1
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HTTP_GET {
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url {
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path /
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status_code 200
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}
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connect_timeout 8
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nb_get_retry 2
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delay_before_retry 2
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connect_port 7480
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}
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}
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real_server 10.1.1.107 7480 {
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weight 1
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HTTP_GET {
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url {
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path /
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status_code 200
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}
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connect_timeout 8
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nb_get_retry 2
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delay_before_retry 2
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connect_port 7480
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}
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}
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real_server 10.1.1.108 7480 {
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weight 1
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HTTP_GET {
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url {
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path /
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status_code 200
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}
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connect_timeout 8
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nb_get_retry 2
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delay_before_retry 2
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connect_port 7480
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}
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}
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}
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```
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## 不抢占自动切换两台 Redis 主从状态
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- MASTER/BACKUP 完整配置
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```
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global_defs {
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router_id ka101 #BACKUP 这里是 ka102
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script_user root
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enable_script_security
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}
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vrrp_script chk_redis {
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script "/usr/bin/systemctl status redis"
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interval 2
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weight 0
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fall 2
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rise 2
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}
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vrrp_instance VI_1 {
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state BACKUP #MASTER 和 BACKUP 这里都是 BACKUP
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virtual_router_id 51
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priority 150 #BACKUP 这里是 100
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advert_int 1
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nopreempt #BACKUP 优先级低，需注释此行
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interface eth0
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notify_master /etc/keepalived/scripts/master.sh
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notify_backup /etc/keepalived/scripts/backup.sh
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track_script {
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chk_redis
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}
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authentication {
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auth_type PASS
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auth_pass 123456
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}
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virtual_ipaddress {
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10.1.1.100/24 dev eth0
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}
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}
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```
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- 在全部 redis 服务器上创建 /etc/keepalived/scripts/master.sh 脚本，内容如下
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```bash
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#!/bin/bash
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#
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/usr/bin/sed -i '/^slaveof/d' /etc/redis.conf
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/usr/bin/systemctl restart redis
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```
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- 在 ka101 上创建 /etc/keepalived/scripts/backup.sh 脚本，内容如下
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```bash
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#!/bin/bash
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#
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/usr/bin/sed -i '/^slaveof/d' /etc/redis.conf
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echo 'slaveof 10.1.1.102 6379' >> /etc/redis.conf
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/usr/bin/systemctl restart redis
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```
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- 在 ka102 上创建 /etc/keepalived/scripts/backup.sh 脚本，内容如下
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```bash
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#!/bin/bash
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#
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/usr/bin/sed -i '/^slaveof/d' /etc/redis.conf
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echo 'slaveof 10.1.1.101 6379' >> /etc/redis.conf
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/usr/bin/systemctl restart redis
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```
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- 在全部 redis 服务器上赋予脚本可执行权限
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```bash
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chmod 0755 /etc/keepalived/scripts/*.sh
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```
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- 修改 redis 配置
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```
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requirepass redis_password
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maxclients 1000
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maxmemory 4294967296
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maxmemory-policy volatile-lru
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```
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