keepalived+nginx+tomcat高可用
1.要求
| 角色 | 主机名 | 软件 | IP地址 |
|---|---|---|---|
| 用户 | client | 192.168.72.90 | |
| keepalived | vip | 192.168.72.100 | |
| master | master | keepalived, nginx | 192.168.72.30 |
| backup | backup | keepalived, nginx | 192.168.72.32 |
| web | tomcat1 | tomcat | 192.168.72.41 |
| web | tomcat2 | tomcat | 192.168.72.42 |
1.搭建Tomcat
1.1下载jdk
wget https://download.oracle.com/java/21/latest/jdk-21_linux-x64_bin.tar.gz
1.2.查看文件以及解压文件
ls
anaconda-ks.cfg jdk-21_linux-x64_bin.tar.gz
tar -xzf jdk-21_linux-x64_bin.tar.gz -C /usr/local
ls /usr/local/jdk-21.0.6/
bin conf include jmods legal lib LICENSE man README release
1.3配置jdk
vim /etc/profile
cat /etc/profile
export JAVA_HOME=/usr/local/jdk-21.0.6/
export PATH=$PATH:$JAVA_HOME/bin
1.4刷新文件配置生效
source /etc/profile
1.5验证jdk是否生效
java -version
1.6关闭防火墙以及selinux
systemctl disabled firewalld
setenforce 0
2.在tomact1安装配置Tomact
2.1下载tomact
wget https://dlcdn.apache.org/tomcat/tomcat-11/v11.0.5/bin/apache-tomcat-11.0.5.tar.gz
2.2查看文件并解压
ls
anaconda-ks.cfg apache-tomcat-11.0.5.tar.gz
jdk-21_linux-x64_bin.tar.gz
tar -xzf apache-tomcat-11.0.5.tar.gz -C /usr/local
ls /usr/local
2.3配置tomact相关环境
vim /etc/profile
cat /etc/profile
export TOMACT_HOME=/usr/local/apache-tomcat-11.0.5
export PATH=$PATH:$TOMACT_HOME/bin
2.4刷新配置
source /etc/profile
2.5启动tomact
startup.sh
3.在tomact2上安装jdk以及tomact
3.1复制jdk安装目录
scp -r /usr/local/jdk-21.0.6/ [email protected]:/usr/local/ >/dev/null
3.2复制tomact安装目录
scp -r /usr/local/apache-tomcat-11.0.5/ [email protected]:/usr/local > /dev/null
3.3复制/etc/profile文件
scp /etc/profile [email protected]:/etc/profile/
3.4验证复制的目录
ls /usr/local
bin etc games include jdk-21.0.6 lib lib64 libexec sbin share
src apache-tomcat-11.0.5
3.5刷新/etc/profile
source /etc/profile
java -version
3.6启动tomact
startup.sh
Using CATALINA_BASE: /usr/local/tomcat-11.0.5 Using CATALINA_HOME:
/usr/local/tomcat-11.0.5 Using CATALINA_TMPDIR:
/usr/local/tomcat-11.0.5/temp Using JRE_HOME:
/usr/local/jdk-21.0.6/ Using CLASSPATH:
/usr/local/tomcat-11.0.5/bin/bootstrap.jar:/usr/local/tomcat-11.0.5/bin/tomcat-juli.jar Using CATALINA_OPTS: Tomcat started.
4.修改tomact主页
4.1修改tomact1主页
cd /usr/local/apache-tomcat-11.0.5/webapps/
ls
docs examples host-manager manager ROOT
rm -rf docs examples host-manager manager
cd /ROOT
rm -rf *
vim index.jsp
cat index.jsp
tomact1 10.10.10.41
4.2修改tomact2主页
cd /usr/local/apache-tomcat-11.0.5/webapps/
ls
docs examples host-manager manager ROOT
rm -rf docs examples host-manager manager
cd /ROOT
rm -rf *
vim index.jsp
cat index.jsp
tpmact 10.10.10.42
curl 10.10.10.42:8080
tomact 10.10.10.42
5.搭建nginx服务
5.1在master上搭建nginx服务
5.1.1配置仓库
vim /etc/yum/repos.d/master.repo
cat etc/yum/repos.d/master.repo
[BaseOS]
name=BaseOS
baseurl=/mnt/BaseOS
gpgcheck=0
[AppStream]
name=AppStream
baseurl=/mnt/AppStream
gpgcheck=0
5.1.2挂载仓库
mount /dev/sr0 /mnt
5.1.3 下载nginx服务
dnf install nginx -y
5.1.4 配置nginx
vim /etc/nginx/conf.d/master.conf
cat /etc/nginx/conf.d/master.conf
upstream tomact1{
server_name 10.10.10.41:8080;
server_name 10.10.10.42:8080;
}
server{
server_name 10.10.10.30;
listen 80;
access_log /var/log/nginx/master_access.log;
error_log /var/log/nginx/master_error.log;
location / {
proxy_pass http://tomact1;
}
}
5.1.5启动nginx服务
systemctl start nginx
5.1.6测试
curl http://10.10.10.30
tomact1 10.10.10.41
curl http://10.10.10.30
tomact2 10.10.10.42
5.2在backup上搭建nginxf服务
5.2.1配置仓库
vim /etc/yum/repos.d/master.repo
cat etc/yum/repos.d/master.repo
[BaseOS]
name=BaseOS
baseurl=/mnt/BaseOS
gpgcheck=0
[AppStream]
name=AppStream
baseurl=/mnt/AppStream
gpgcheck=0
5.2.2挂载仓库
mount /dev/sr0 /mnt
5.2.3 下载nginx服务
dnf install nginx -y
5.2.4 配置nginx
vim /etc/nginx/conf.d/backup.conf
cat /etc/nginx/conf.d/backup.conf
upstream tomact2 {
server 10.10.10.41:8080;
server 10.10.10.42:8080;
}
server {
server_name 10.10.10.42;
listen 80;
access_log /var/log/nginx/baskup_access.log;
error_log /var/log/nginx/backup_error.log;
location / {
proxy_pass http://tomact2;
}
}
5.2.5启动nginx服务
systemctl start nginx
5.2.6测试
curl 10.10.10.32
tomact1 10.10.10.41
curl 10.10.10.32
tomact2 10.10.10.42
6.搭建keepalived
6.1在master上搭建keepalived
6.1.1下载keepalived服务
dnf install keepalived -y
6.1.2配置keepalived文件
vim /etc/keepalived/keepalived.conf
cat /etc/keepalived/keepalived.conf
global_defs {
router_id master
}
vrrp_instance VI_1 {
state MASTER
interface ens160
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
10.10.10.100
}
}
6.2在backup上配置keepalived
6.2.1下载keepalived服务
dnf install keepalived -y
6.2.2配置keepalived文件
vim /etc/keepalived/keepalived.conf
cat /etc/keepalived/keepalived.conf
global_defs {
router_id backup
}
vrrp_instance VI_1 {
state BACKUP
interface ens160
virtual_router_id 51
priority 90
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
10.10.10.100
}
}
6.3启动keepalived服务
master:
systemctl start keepalived
backup:
systemctl start keepalived
6.4 修改nginx文件
vim /etc/nginx/conf.d/master.conf
cat /etc/nginx/conf.d/master.conf
upstream tomact2 {
server 10.10.10.41:8080;
server 10.10.10.42:8080;
}
server {
server_name 10.10.10.100;
listen 80;
access_log /var/log/nginx/baskup_access.log;
error_log /var/log/nginx/backup_error.log;
location / {
proxy_pass http://tomact2;
}
}
vim /etc/nginx/conf.d/backup.conf
cat /etc/nginx/conf.d/backup.conf
upstream tomact2 {
server 10.10.10.41:8080;
server 10.10.10.42:8080;
}
server {
server_name 10.10.10.100;
listen 80;
access_log /var/log/nginx/baskup_access.log;
error_log /var/log/nginx/backup_error.log;
location / {
proxy_pass http://tomact2;
}
}
6.5重启nginx服务
systemctl reatart nginx
curl 10.10.10.100
tomact1 10.10.10.41
curl 10.10.10.100
tomact2 10.10.10.42
7.配置nginx高可用
7.1 编写检测脚本
vim /etc/keepalived/check_nginx.sh
#!/bin/bash
counter=$(ps -c nginx --no-header | wc -l)
if [$counter -eq 0];then
systemctl start nginx
if [ `ps -C nginx --no-header | wc -l` -eq 0]; rhen
systemctl stop keepalived
fi
fi
7.2给脚本赋予执行权限
chmod +x /etc/keepalived/check_nginx.sh
7.3将脚本文件复制到backup主机中
scp /etc/keepalived/check_nginx.sh [email protected]:/etc/keepalived/
7.4在backup中验证
ll /etc/keepalived
-rwxr-xr-x. 1 root root 191 Mar 20 21:15 check_nginx.sh
-rw-r–r–. 1 root root 286 Mar 20 20:58 keepalived.conf
7.5修改master主机上keepalived.conf文件
vim /etc/keepalived/keepalived.conf
global_defs {
router_id master
}
vrrp_script check_nginx{
script "/etc/keepalived/check_nginx.sh"
interval 2
}
vrrp_instance VI_1 {
state MASTER
interface ens160
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
10.10.10.100
}
track_script {
check_nginx
}
}
7.6修改backup中keepalived.conf文件
vim /etc/keepalived/keepalived.conf
global_defs {
router_id backup
}
vrrp_script check_nginx{
script "/etc/keepalived/check_nginx.sh"
interval 2
}
vrrp_instance VI_1 {
state BACKUP
interface ens160
virtual_router_id 51
priority 90
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
10.10.10.100
}
track_script {
check_nginx
}
}
7.7重启keepalived服务
systemctl reatart keepalived
8.测试高可用
8.1关闭master上nginx服务
systemctl stop nginx
curl 10.10.10.100
tomact1 10.10.10.41
curl 10.10.10.100
tomact210.10.10.42
ps -ef | grep nginx
root 3471 1 0 21:23 ? 00:00:00 nginx: master
process /usr/sbin/nginx nginx 3472 3471 0 21:23 ?
00:00:00 nginx: worker process nginx 3473 3471 0 21:23 ?
00:00:00 nginx: worker process nginx 3474 3471 0 21:23 ?
00:00:00 nginx: worker process
发现，当我们关闭 nginx 服务后，我们的脚本就会执行，从而自动帮我们把 nginx 服务启动起来。
8.2关闭keepalived和nginx
systemctl stop keepalived
systemctl stop nginx
curl 10.10.10.30
tomact1 10.10.10.41
curl 10.10.10.32
tomact2 10.10.10.42
ps -ef | grep nginx
root 3745 1489 0 21:25 pts/0 00:00:00 grep --color=auto
nginx
systemctl start keepalived
ps -ef | grep nginx
root 3789 1 0 21:26 ? 00:00:00 nginx: master
process /usr/sbin/nginx nginx 3790 3789 0 21:26 ?
00:00:00 nginx: worker process nginx 3791 3789 0 21:26 ?
00:00:00 nginx: worker process nginx 3792 3789 0 21:26 ?
00:00:00 nginx: worker process
至此，keepalived + nginx + tomcat 的高可用就搭建完成。