keepalived+nginx部署高可用环境
作者:互联网
注:实际上可以去掉nginx这一层,使用keepalived部署4节点。(德邦这边因为一开始部署的是双nginx,后续需要修改)
一、需求
1)高可用环境
两个nginx节点、两个cmp节点、主主数据库
2)使用vip地址访问cmp服务
配置nginx+keepalived服务
二、nginx、cmp安装,mysql双主模式配置
三、相关环境
vip nginx:192.168.7.88 vip 数据库:192.168.7.89 nginx:192.168.7.69、192.168.7.70 cmp:192.168.7.71、192.168.7.72 mysql:192.168.7.73、192.168.7.74 |
四、在Nginx节点安装和配置keepalived
1.安装keepalived
方式一:yum安装
yum install -y keepalived |
方式二:rpm安装
1)rpm -ivh keepalived-1.3.5-8.el7_6.x86_64.rpm --force --nodeps 2)将缺少的库文件放入/usr/lib64和/usr/lib目录下 libnetsnmpmibs.so.31 libnetsnmpagent.so.31 libnl-3.so.200 libnl-genl-3.so.200 |
2.keepalived服务开机自启动
chkconfig keepalived on |
3.修改配置文件keepalived.conf
注:这里配置的是主备模式
nginx主节点:
vi /etc/keepalived/keepalived.conf MASTER:nginx-1
cat <<EOF > /etc/keepalived/keepalived.conf ! Configuration File for keepalived
global_defs { router_id nginx-1 }
vrrp_script chk_nginx { script "/opt/chk_nginx.sh" interval 2 weight -5 fall 2 rise 1 }
vrrp_instance VI_1 { state MASTER interface eth0 #指定HA监测网络的接口 ifconfig 查看 mcast_src_ip 192.168.7.69 #本机IP virtual_router_id 88 #虚拟路由 priority 101 #优先级 advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 192.168.7.88 #vip }
track_script { chk_nginx } } EOF |
nginx从节点:
vi /etc/keepalived/keepalived.conf BACKUP:nginx-2
cat <<EOF > /etc/keepalived/keepalived.conf ! Configuration File for keepalived
global_defs { router_id nginx-2 }
vrrp_script chk_http_port { script "/opt/chk_nginx.sh" interval 2 weight -5 fall 2 rise 1 }
vrrp_instance VI_1 { state BACKUP interface eth0 #指定HA监测网络的接口 ifconfig 查看 mcast_src_ip 192.168.7.70 #本机IP virtual_router_id 88 #虚拟路由 priority 99 #优先级 advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 192.168.7.88 #vip }
track_script { chk_http_port } } EOF |
4.keepalived监控Nginx脚本
1)让keepalived监控Nginx的状态
vi /opt/chk_nginx.sh
#!/bin/bash counter=$(ps -C nginx --no-heading|wc -l) echo "$counter" if [ "${counter}" = "0" ]; then /usr/local/nginx/sbin/nginx -c /usr/local/nginx/conf/nginx.conf sleep 2 counter=$(ps -C nginx --no-heading|wc -l) if [ "${counter}" = "0" ]; then /etc/init.d/keepalived stop fi fi |
2)设置脚本文件的权限并测试
chmod 755 /opt/chk_nginx.sh sh /opt/chk_nginx.sh |
5.keepalived服务相关命令
service keepalived start #启动服务 service keepalived stop #停止服务 service keepalived restart #重启服务 |
五、在Mysql节点安装和配置keepalived
1.安装和配置keepalived
与nginx配置keepalived大同小异,略。
2.keepalived监控Mysql脚本
1)让keepalived监控Mysql的状态
vi /opt/chk_mysql.sh
#!/bin/bash counter=$(netstat -na|grep "LISTEN"|grep "3306"|wc -l) echo "$counter" if [ "${counter}" -eq "0" ]; then /etc/init.d/keepalived stop fi |
2)设置脚本文件的权限并测试
chmod 755 /opt/chk_mysql.sh sh /opt/chk_mysql.sh |
3.验证keepalived服务
1)在mysql两个节点上使用命令查看是否能连接数据库
mysql -uroot -p -P3306 -h192.168.7.89 |
2)如果不能连接,有以下原因:
- keepalived服务配置失败
- 端口不通
4.修改cmp节点的配置文件
1)将fit2cloud.properties、keycloak.properties中的数据库服务器地址改成mysql的vip地址 2)重启cmp服务 service fit2cloud restart |
参考:https://blog.csdn.net/miss1181248983/article/details/89139951
六、配置keepalived日志
1.编辑系统日志配置文件
注:centos7以上是rsyslog
1) 在最后一行加上下面的配置 vim /etc/rsyslog.conf
local4.* /etc/keepalived/logs/keepalived.log
2) 重启系统日志服务 service rsyslog restart |
2.编辑keepalived服务文件
1)修改最后一行的配置 vi /etc/sysconfig/keepalived
#KEEPALIVED_OPTIONS="-D" KEEPALIVED_OPTIONS="-D -d -S 4"
2)重启keepalived服务 service keepalived restart |
3.查看keeaplived日志
tail -f /etc/keepalived/keepalived.log |
参考:https://blog.csdn.net/weiyuefei/article/details/78131509
七、验证keepalived服务
1)在主节点使用ip a查看,发现eth0网络接口下多了一个IP(vip地址)
2)关闭主节点的keepalived服务,使用ip a查看发现vip不在eth0下面了;在从节点使用ip a查看,发现eth0网络接口下多了一个IP(vip地址)
图略
3)重启主节点的keepalived服务,使用ip a查看发现vip地址又回到了主节点eth0下面
4)keepalived配置成功
可以通过vip地址访问cmp服务:http://192.168.7.88
八、注意事项
1.在同一个网段内的,若为不同的应用做高可用,不同应用使用不同的VIP,那么vrrp_instance、virtual_router_id的名字在不同的高可用实例必须设置不同的值区分开。
2.主备模式的keepalived设置优先级:设置priority的值,主节点的值设置的大一些,主备节点的优先级的值差距不要太大。
3.nginx不要缺少了重定向配置:
proxy_set_header Host $host; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; |
九、安装和配置keepalived服务常见问题
1.离线安装keepalived缺少库文件
解决方法:
1)将缺少的库文件放入/usr/lib64目录下
libnl-3.so.200
libnl-genl-3.so.200
2)重启keepalived服务
2.keepalived.conf文件中的网卡配错了,需要将eth0改为ens192
解决方法:
1)使用ifconfig查看网络配置
2)修改keepalived.conf文件,配置正确的网络接口
3)重启keepalived服务
标签:部署,chk,keepalived,192.168,nginx,vip,节点 来源: https://blog.csdn.net/qq_21873747/article/details/104751332