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keepalived高可用三主热备架构(keepalived+nginx+tomcat)

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发表于 昨天 20:30 来自手机 | 显示全部楼层 |阅读模式

1、捏造环境准备：

脚色主机名软件IP地点
用户client192.168.250.90
keepalivedVip                        192.168.250.100
                        192.168.250.101
                        192.168.250.101
                       
                       
masterserverakeepalived、nginx192.168.250.30
backupserverbkeepalived、nginx192.168.250.31
backupserverckeepalived、nginx192.168.250.32
webtomcat1tomcat192.168.250.41
webtomcat2tomcat192.168.250.42
                        web
                        		tomcat3tomcat192.168.250.43
DNS轮询DNSnginx192.168.250.11
留意：开始搭建之前确保全部捏造机防火墙和selinux都要关闭 
2、搭建tomcat

（1）搭建JDK环境
  2. wget https://download.oracle.com/java/21/latest/jdk21_linux-x64_bin.tar.gz
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将JDK21的压缩包利用tar下令压缩到/usr/local目次下
  2. tar -zxf jdk-21_linux-x64_bin.tar.gz -C /usr/local/
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进入/etc/profile目次下参加以下内容：
  2. export JAVA_HOME=/usr/local/jdk-21.0.6/
  3. export PATH=$PATH:$JAVA_HOME/bin
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利用source /etc/profile 加载文件
检察java环境是否搭建乐成，利用java -version 查询java的版本：
  2. [root@tomcat1 ~]# java -version
  3. java version "21.0.6" 2025-01-21 LTS
  4. Java(TM) SE Runtime Environment (build 21.0.6+8-LTS-188)
  5. Java HotSpot(TM) 64-Bit Server VM (build 21.0.6+8-LTS-188, mixed mode, sharing)
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（2）搭建web页面

tomcat1

下载tomcat压缩包：
  2. wget https://dlcdn.apache.org/tomcat/tomcat11/v11.0.5/bin/apache-tomcat-11.0.5.tar.gz
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 将压缩包解压到/usr/local下
  2. tar -zxf apache-tomcat-11.0.5.tar.gz -C /usr/local/
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在/etc/profile目次下添加如下内容：
  2. export TOMCAT_HOME=/usr/local/apache-tomcat-11.0.5
  3. export PATH=$PATH:$TOMCAT_HOME/bin
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这时环境变量就添加好了，利用source /etc/profile重新加载文件，然后利用startup.sh启动tomcat如下：
  2. [root@tomcat1 ~]# startup.sh
  3. Using CATALINA_BASE:   /usr/local/apache-tomcat-11.0.5
  4. Using CATALINA_HOME:   /usr/local/apache-tomcat-11.0.5
  5. Using CATALINA_TMPDIR: /usr/local/apache-tomcat-11.0.5/temp
  6. Using JRE_HOME:        /usr/local/jdk-21.0.6/
  7. Using CLASSPATH:       /usr/local/apache-tomcat-11.0.5/bin/bootstrap.jar:/usr/local/apache-tomcat-11.0.5/bin/tomcat-juli.jar
  8. Using CATALINA_OPTS:   
  9. Tomcat started.
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重新界说web页面
  3. cd /usr/local/apache-tomcat-11.0.5/webapps/ROOT/
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删除此目次下的全部内容，再重新界说一个以.jsp末端的文件：
  2. [root@tomcat1 ROOT]# rm -rf *
  3. [root@tomcat1 ROOT]# vim index.jsp
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index.jsp中的内容可任意界说（这里我们方便区别别的两台tomcat界说成ip地点加主机名）
  2. [root@tomcat1 ROOT]# cat index.jsp
  3. tomcat1 192.168.250.41
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此时我们在欣赏器输入http://192.168.250.41:8080验证tomcat是否乐成

已经乐成看到我们自界说的内容！！
还剩别的两台tomcat和第一台的搭建一摸一样唯一差别的就是自界说的web界面：
tomcat2

利用scp下令将tomcat1上的jdk文件和tomcat文件传到tomcat2上：
  2. scp -r /usr/local/jdk-21.0.6/ root@192.168.250.42:/usr/local
  3. scp -r /usr/local/apache-tomcat-11.0.5/ root@192.168.250.42:/usr/local
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 再在tomcat2上检察文件是否传送乐成：
  2. [root@tomcat2 ~]# ls /usr/local/
  3. apache-tomcat-11.0.5  bin  etc  games  include  jdk-21.0.6  lib  lib64  libexec  sbin  share  src
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再将tomcat1上的/etc/profile文件传到tomcat2上：
  2. [root@tomcat1 ~]# scp /etc/profile root@192.168.250.42:/etc
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检察tomcat2上/etc/profile文件下的倒数四行，是否传送乐成：
  1. [root@tomcat2 ~]# tail -n -4 /etc/profile
  2. export JAVA_HOME=/usr/local/jdk-21.0.6/
  3. export PATH=$PATH:$JAVA_HOME/bin
  5. export TOMCAT_HOME=/usr/local/apache-tomcat-11.0.5
  6. export PATH=$PATH:$TOMCAT_HOME/bin
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传送乐成！！此时须要利用source /etc/profile 更新文件再利用java -version 和startup.sh 启动tomcat
  2. [root@tomcat2 ~]# source /etc/profile
  3. [root@tomcat2 ~]# java -version
  4. java version "21.0.6" 2025-01-21 LTS
  5. Java(TM) SE Runtime Environment (build 21.0.6+8-LTS-188)
  6. Java HotSpot(TM) 64-Bit Server VM (build 21.0.6+8-LTS-188, mixed mode, sharing)
  7. [root@tomcat2 ~]# startup.sh
  8. Using CATALINA_BASE:   /usr/local/apache-tomcat-11.0.5
  9. Using CATALINA_HOME:   /usr/local/apache-tomcat-11.0.5
  10. Using CATALINA_TMPDIR: /usr/local/apache-tomcat-11.0.5/temp
  11. Using JRE_HOME:        /usr/local/jdk-21.0.6/
  12. Using CLASSPATH:       /usr/local/apache-tomcat-11.0.5/bin/bootstrap.jar:/usr/local/apache-tomcat-11.0.5/bin/tomcat-juli.jar
  13. Using CATALINA_OPTS:   
  14. Tomcat started.
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重新界说web界面：
  3. cd /usr/local/apache-tomcat-11.0.5/webapps/ROOT/
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删除此目次下的全部内容，再重新界说一个以.jsp末端的文件：
  2. [root@tomcat1 ROOT]# rm -rf *
  3. [root@tomcat1 ROOT]# vim index.jsp
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这里我们将tomcat2上的web界面界说为：
  2. [root@tomcat2 ~]# cat /usr/local/apache-tomcat-11.0.5/webapps/ROOT/index.jsp
  3. tomcat2 192.168.250.42
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再在欣赏器中输入：http//192.168.250.42:8080检察

tomcat3

和tomcat2一样先从tomcat1大将jdk以及tomcat传到本机上再将/etc/profile也传到本机上再启动tomcat末了自界说web页面然后测试是否见效：
传送文件：
  2. scp -r /usr/local/jdk-21.0.6/ root@192.168.250.42:/usr/local
  3. scp -r /usr/local/apache-tomcat-11.0.5/ root@192.168.250.42:/usr/localscp /etc/profile root@192.168.250.42:/etc
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 启动tomcat：
  2. [root@tomcat3 ~]# startup.sh
  3. Using CATALINA_BASE:   /usr/local/apache-tomcat-11.0.5
  4. Using CATALINA_HOME:   /usr/local/apache-tomcat-11.0.5
  5. Using CATALINA_TMPDIR: /usr/local/apache-tomcat-11.0.5/temp
  6. Using JRE_HOME:        /usr/local/jdk-21.0.6/
  7. Using CLASSPATH:       /usr/local/apache-tomcat-11.0.5/bin/bootstrap.jar:/usr/local/apache-tomcat-11.0.5/bin/tomcat-juli.jar
  8. Using CATALINA_OPTS:   
  9. Tomcat started.
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重新界说页面：
  2. [root@tomcat3 ~]# cat /usr/local/apache-tomcat-11.0.5/webapps/ROOT/index.jsp
  3. tomcat3 192.168.250.43
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在欣赏器中输入http://192.168.250.43:8080

web服务全部搭建完成！！！
3、搭建keepalived高可用与主热备架构：

设置nginx

在servera上面下载nginx、keepalived软件：
  2. dnf install nginx keepalived -y
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servera

在/etc/nginx/conf.d下创建以.conf末端的文件并写入以下内容：
  2. [root@servera ~]# cat /etc/nginx/conf.d/servera.conf
  3. upstream tomcat1 {
  4.         server 192.168.250.41:8080;
  5.         server 192.168.250.42:8080;
  6.         server 192.168.250.43:8080;
  7. }
  8. server {
  9.         listen 80;
  10.         server_name 192.168.250.30;
  11.         access_log /var/log/nginx/master_access.log;
  12.         error_log /var/log/nginx/master_error.log;
  13.         location / {
  14.                 proxy_pass   http://tomcat1;
  15.         }
  16. }
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启动nginx并利用curl测试是否轮询访问：
  2. [root@servera ~]#
  3. systemctl start nginx
  4. [root@servera ~]# curl 192.168.250.30
  5. tomcat1 192.168.250.41
  6. [root@servera ~]# curl 192.168.250.30
  7. tomcat2 192.168.250.42
  8. [root@servera ~]# curl 192.168.250.30
  9. tomcat3 192.168.250.43
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测试乐成！！！！
serverb

同上述servera一样先下载软件再编写设置文件末了测试：
  1. [root@serverb ~]#
  2. dnf install nginx keepalived -y[root@serverb ~]# cat /etc/nginx/conf.d/serverb.conf upstream tomcat2 {        server 192.168.250.41:8080;        server 192.168.250.42:8080;        server 192.168.250.43:8080;}server {        listen 80;        server_name 192.168.250.31;        access_log /var/log/nginx/master_access.log;        error_log /var/log/nginx/master_error.log;        location / {                proxy_pass   http://tomcat2;        }}
  3. systemctl start nginx[root@serverb ~]# curl 192.168.250.31tomcat1 192.168.250.41[root@serverb ~]# curl 192.168.250.31tomcat2 192.168.250.42[root@serverb ~]# curl 192.168.250.31tomcat3 192.168.250.43
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serverc

同上：
  1. [root@serverb ~]#
  2. dnf install nginx keepalived -y[root@serverb ~]# cat /etc/nginx/conf.d/serverc.conf upstream tomcat3 {        server 192.168.250.41:8080;        server 192.168.250.42:8080;        server 192.168.250.43:8080;}server {        listen 80;        server_name 192.168.250.32;        access_log /var/log/nginx/master_access.log;        error_log /var/log/nginx/master_error.log;        location / {                proxy_pass   http://tomcat3;        }}
  3. systemctl start nginx[root@serverb ~]# curl 192.168.250.32tomcat1 192.168.250.41[root@serverb ~]# curl 192.168.250.32tomcat2 192.168.250.42[root@serverb ~]# curl 192.168.250.32tomcat3 192.168.250.43
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设置keepalived高可用

servera

编写脚本实现高可用：
脚本文件放在/etc/keepalived下
  2. [root@servera ~]# cat /etc/keepalived/check_nginx.sh
  3. #!/bin/bash
  4. counter=$(ps -C nginx --no-header| wc -l)
  5. if [ $counter -eq 0 ]; then
  6.        
  7. systemctl start nginx
  8.         if [ `ps -C nginx --no-header| wc -l` -eq 0 ]; then
  9.                 systemctl stop keepalived
  10.         fi
  11. fi
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给脚本文件赋权：
  2. chmod +x /etc/keepalived/check_nginx.sh
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 检察是否赋权乐成：

打开keepalived的设置文件举行如下修改：
  2. global_defs {
  3.    router_id MASTER
  4. }
  6. vrrp_script chk_nginx {
  7.     script "/etc/keepalived/check_nginx.sh"
  8.     interval 2
  9. }
  11. vrrp_instance VI_1 {
  12.     state MASTER
  13.     interface ens160
  14.     virtual_router_id 51
  15.     priority 100
  16.     advert_int 1
  17.     authentication {
  18.         auth_type PASS
  19.         auth_pass 1111
  20.     }
  21.     virtual_ipaddress {
  22.         192.168.250.100
  23.     }
  24.     track_script {
  25.         chk_nginx
  26.     }
  28. }
  30. global_defs {
  31.    router_id BACKUP
  32. }
  34. vrrp_script chk_nginx {
  35.     script "/etc/keepalived/check_nginx.sh"
  36.     interval 2
  37. }
  39. vrrp_instance VI_2 {
  40.     state BACKUP
  41.     interface ens160
  42.     virtual_router_id 52
  43.     priority 80
  44.     advert_int 1
  45.     authentication {
  46.         auth_type PASS
  47.         auth_pass 1111
  48.     }
  49.     virtual_ipaddress {
  50.         192.168.250.101
  51.     }
  52.     track_script {
  53.         chk_nginx
  54.     }
  56. }
  59. global_defs {
  60.    router_id BACKUP
  61. }
  63. vrrp_script chk_nginx {
  64.     script "/etc/keepalived/check_nginx.sh"
  65.     interval 2
  66. }
  68. vrrp_instance VI_3 {
  69.     state BACKUP
  70.     interface ens160
  71.     virtual_router_id 53
  72.     priority 60
  73.     advert_int 1
  74.     authentication {
  75.         auth_type PASS
  76.         auth_pass 1111
  77.     }
  78.     virtual_ipaddress {
  79.         192.168.250.102
  80.     }
  81.     track_script {
  82.         chk_nginx
  83.     }
  85. }
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启动keepalived服务检察是否出现漂移IP
  2. systemctl start keepalived
  3. [root@servera ~]# ip ad
  4. 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
  5.     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
  6.     inet 127.0.0.1/8 scope host lo
  7.        valid_lft forever preferred_lft forever
  8.     inet6 ::1/128 scope host
  9.        valid_lft forever preferred_lft forever
  10. 2: ens160: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
  11.     link/ether 00:0c:29:ee:31:81 brd ff:ff:ff:ff:ff:ff
  12.     altname enp3s0
  13.     inet 192.168.250.30/24 brd 192.168.250.255 scope global noprefixroute ens160
  14.        valid_lft forever preferred_lft forever
  15.     inet 192.168.250.100/32 scope global ens160
  16.        valid_lft forever preferred_lft forever
  17.     inet6 fe80::20c:29ff:feee:3181/64 scope link noprefixroute
  18.        valid_lft forever preferred_lft forever
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 此时出现的inet 192.168.250.100/32 scope global ens160就是漂移ip
修改nginx设置文件，将server_nameIP改成漂移IP即192.168.250.100
  2. [root@servera ~]# cat /etc/nginx/conf.d/servera.conf
  3. upstream tomcat1 {
  4.         server 192.168.250.41:8080;
  5.         server 192.168.250.42:8080;
  6.         server 192.168.250.43:8080;
  7. }
  8. server {
  9.         listen 80;
  10.         server_name 192.168.250.100;
  11.         access_log /var/log/nginx/master_access.log;
  12.         error_log /var/log/nginx/master_error.log;
  13.         location / {
  14.                 proxy_pass   http://tomcat1;
  15.         }
  16. }
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重新启动nginx服务 
serverb

设置同上（特殊须要留意的是要留意keepalived设置文件中三个漂移ip的优先级）
将servera的脚本文件拷贝到serverb中
  2. scp /etc/keepalived/check_nginx.sh root@192.168.250.31:/keepalived/
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修改keepalived的设置文件：
  2. [root@serverb ~]# cat /etc/keepalived/keepalived.conf
  3. global_defs {
  4.    router_id BACKUP
  5. }
  7. vrrp_script chk_nginx {
  8.     script "/etc/keepalived/check_nginx.sh"
  9.     interval 2
  10. }
  12. vrrp_instance VI_1 {
  13.     state BACKUP
  14.     interface ens160
  15.     virtual_router_id 51
  16.     priority 60
  17.     advert_int 1
  18.     authentication {
  19.         auth_type PASS
  20.         auth_pass 1111
  21.     }
  22.     virtual_ipaddress {
  23.         192.168.250.100
  24.     }
  25.     track_script {
  26.         chk_nginx
  27.     }
  29. }
  31. global_defs {
  32.    router_id MASTER
  33. }
  35. vrrp_script chk_nginx {
  36.     script "/etc/keepalived/check_nginx.sh"
  37.     interval 2
  38. }
  40. vrrp_instance VI_2 {
  41.     state MASTER
  42.     interface ens160
  43.     virtual_router_id 52
  44.     priority 100
  45.     advert_int 1
  46.     authentication {
  47.         auth_type PASS
  48.         auth_pass 1111
  49.     }
  50.     virtual_ipaddress {
  51.         192.168.250.101
  52.     }
  53.     track_script {
  54.         chk_nginx
  55.     }
  57. }
  60. global_defs {
  61.    router_id BACKUP
  62. }
  64. vrrp_script chk_nginx {
  65.     script "/etc/keepalived/check_nginx.sh"
  66.     interval 2
  67. }
  69. vrrp_instance VI_3 {
  70.     state BACKUP
  71.     interface ens160
  72.     virtual_router_id 53
  73.     priority 80
  74.     advert_int 1
  75.     authentication {
  76.         auth_type PASS
  77.         auth_pass 1111
  78.     }
  79.     virtual_ipaddress {
  80.         192.168.250.102
  81.     }
  82.     track_script {
  83.         chk_nginx
  84.     }
  86. }
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启动keepalived服务检察漂移ip
  2. [root@serverb ~]# systemctl start keepalived
  3. [root@serverb ~]# ip ad
  4. 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
  5.     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
  6.     inet 127.0.0.1/8 scope host lo
  7.        valid_lft forever preferred_lft forever
  8.     inet6 ::1/128 scope host
  9.        valid_lft forever preferred_lft forever
  10. 2: ens160: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
  11.     link/ether 00:0c:29:c2:e1:65 brd ff:ff:ff:ff:ff:ff
  12.     altname enp3s0
  13.     inet 192.168.250.31/24 brd 192.168.250.255 scope global noprefixroute ens160
  14.        valid_lft forever preferred_lft forever
  15.     inet 192.168.250.101/32 scope global ens160
  16.        valid_lft forever preferred_lft forever
  17.     inet6 fe80::20c:29ff:fec2:e165/64 scope link noprefixroute
  18.        valid_lft forever preferred_lft forever
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 此时出现的inet 192.168.250.101/32 scope global ens160就是漂移ip
修改nginx设置文件将server_name 改成漂移ip即192.168.250.101
  2. [root@serverb ~]# cat /etc/nginx/conf.d/serverb.conf
  3. upstream tomcat2 {
  4.         server 192.168.250.41:8080;
  5.         server 192.168.250.42:8080;
  6.         server 192.168.250.43:8080;
  7. }
  8. server {
  9.         listen 80;
  10.         server_name 192.168.250.101;
  11.         access_log /var/log/nginx/master_access.log;
  12.         error_log /var/log/nginx/master_error.log;
  13.         location / {
  14.                 proxy_pass   http://tomcat2;
  15.         }
  16. }
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再重启nginx服务
serverc

同上设置：
将脚本文件拷贝到serverc上，再修改keepalived设置文件，再启动keepalived服务检察漂移ip末了修改nginx服务的设置文件中的server_name修改成漂移文件代码如下：
  2. scp /etc/keepalived/check_nginx.sh root@192.168.250.32:/etc/keepalived/
  4. [root@serverc ~]# cat /etc/keepalived/keepalived.conf
  5. global_defs {
  6.    router_id BACKUP
  7. }
  9. vrrp_script chk_nginx {
  10.     script "/etc/keepalived/check_nginx.sh"
  11.     interval 2
  12. }
  14. vrrp_instance VI_1 {
  15.     state BACKUP
  16.     interface ens160
  17.     virtual_router_id 51
  18.     priority 80
  19.     advert_int 1
  20.     authentication {
  21.         auth_type PASS
  22.         auth_pass 1111
  23.     }
  24.     virtual_ipaddress {
  25.         192.168.250.100
  26.     }
  27.     track_script {
  28.         chk_nginx
  29.     }
  31. }
  33. global_defs {
  34.    router_id BACKUP
  35. }
  37. vrrp_script chk_nginx {
  38.     script "/etc/keepalived/check_nginx.sh"
  39.     interval 2
  40. }
  42. vrrp_instance VI_2 {
  43.     state BACKUP
  44.     interface ens160
  45.     virtual_router_id 52
  46.     priority 60
  47.     advert_int 1
  48.     authentication {
  49.         auth_type PASS
  50.         auth_pass 1111
  51.     }
  52.     virtual_ipaddress {
  53.         192.168.250.101
  54.     }
  55.     track_script {
  56.         chk_nginx
  57.     }
  59. }
  62. global_defs {
  63.    router_id MASTER
  64. }
  66. vrrp_script chk_nginx {
  67.     script "/etc/keepalived/check_nginx.sh"
  68.     interval 2
  69. }
  71. vrrp_instance VI_3 {
  72.     state MASTER
  73.     interface ens160
  74.     virtual_router_id 53
  75.     priority 100
  76.     advert_int 1
  77.     authentication {
  78.         auth_type PASS
  79.         auth_pass 1111
  80.     }
  81.     virtual_ipaddress {
  82.         192.168.250.102
  83.     }
  84.     track_script {
  85.         chk_nginx
  86.     }
  88. }
  89. [root@serverc ~]# systemctl restart keepalived.service
  90. [root@serverc ~]# ip ad
  91. 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
  92.     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
  93.     inet 127.0.0.1/8 scope host lo
  94.        valid_lft forever preferred_lft forever
  95.     inet6 ::1/128 scope host
  96.        valid_lft forever preferred_lft forever
  97. 2: ens160: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
  98.     link/ether 00:0c:29:50:ff:3f brd ff:ff:ff:ff:ff:ff
  99.     altname enp3s0
  100.     inet 192.168.250.32/24 brd 192.168.250.255 scope global noprefixroute ens160
  101.        valid_lft forever preferred_lft forever
  102.     inet 192.168.250.102/32 scope global ens160
  103.        valid_lft forever preferred_lft forever
  104.     inet6 fe80::20c:29ff:fe50:ff3f/64 scope link noprefixroute
  105.        valid_lft forever preferred_lft forever
  106. [root@serverc ~]# cat /etc/nginx/conf.d/serverc.conf
  107. upstream tomcat3 {
  108.         server 192.168.250.41:8080;
  109.         server 192.168.250.42:8080;
  110.         server 192.168.250.43:8080;
  111. }
  112. server {
  113.         listen 80;
  114.         server_name 192.168.250.102;
  115.         access_log /var/log/nginx/master_access.log;
  116.         error_log /var/log/nginx/master_error.log;
  117.         location / {
  118.                 proxy_pass   http://tomcat3;
  119.         }
  120. }
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4、设置DNS轮询

在dns主机上下载nginx
  2. dnf install nginx -y
复制代码
写入设置文件：
  2. [root@dns ~]# cat /etc/nginx/conf.d/dns.conf
  3. upstream web {
  4.         server 192.168.250.100;
  5.         server 192.168.250.101;
  6.         server 192.168.250.102;
  7. }
  8. server {
  9.         listen 80;
  10.         server_name 192.168.250.11;
  11.         access_log /var/log/nginx/access_dns.log;
  12.         error_log /var/log/nginx/error_dns.log;
  13.         location / {
  14.                 proxy_pass http://web;
  15.         }
  16. }
复制代码
 启动nginx服务
  2. systemctl start nginx
复制代码
5、测试：

（1）测试高可用

将servera、serverb、serverc上的nginx服务关闭再检察nginx的历程是否存在：
servera
  2. [root@servera ~]# systemctl stop nginx
  3. [root@servera ~]# ps -ef | grep nginx
  4. root        5650       1  0 15:20 ?        00:00:00 nginx: master process /usr/sbin/nginx
  5. nginx       5651    5650  0 15:20 ?        00:00:00 nginx: worker process
  6. nginx       5652    5650  0 15:20 ?        00:00:00 nginx: worker process
  7. nginx       5653    5650  0 15:20 ?        00:00:00 nginx: worker process
  8. nginx       5654    5650  0 15:20 ?        00:00:00 nginx: worker process
  9. root        5675    1509  0 15:20 pts/0    00:00:00 grep --color=auto nginx
复制代码
serverb
  2. [root@serverb ~]# systemctl stop nginx
  3. [root@serverb ~]# ps -ef | grep nginx
  4. root        5592       1  0 15:21 ?        00:00:00 nginx: master process /usr/sbin/nginx
  5. nginx       5593    5592  0 15:21 ?        00:00:00 nginx: worker process
  6. nginx       5594    5592  0 15:21 ?        00:00:00 nginx: worker process
  7. nginx       5595    5592  0 15:21 ?        00:00:00 nginx: worker process
  8. nginx       5596    5592  0 15:21 ?        00:00:00 nginx: worker process
  9. root        5605    1472  0 15:21 pts/0    00:00:00 grep --color=auto nginx
复制代码
serverc
  2. [root@serverc ~]# systemctl stop nginx
  3. [root@serverc ~]# ps -ef | grep nginx
  4. root        5530       1  0 15:22 ?        00:00:00 nginx: master process /usr/sbin/nginx
  5. nginx       5531    5530  0 15:22 ?        00:00:00 nginx: worker process
  6. nginx       5532    5530  0 15:22 ?        00:00:00 nginx: worker process
  7. nginx       5533    5530  0 15:22 ?        00:00:00 nginx: worker process
  8. nginx       5534    5530  0 15:22 ?        00:00:00 nginx: worker process
  9. root        5544    1474  0 15:22 pts/0    00:00:00 grep --color=auto nginx
复制代码
 测试高可用乐成！！！
（2）测试DNS轮询

在client主机上利用curl下令分别测试192.168.250.100、192.168.250.101、192.168.250.102
  2. [root@client ~]# curl 192.168.250.100
  3. tomcat2 192.168.250.42
  5. [root@client ~]# curl 192.168.250.100
  6. tomcat3 192.168.250.43
  8. [root@client ~]# curl 192.168.250.100
  9. tomcat1 192.168.250.41
  10. [root@client ~]# curl 192.168.250.101
  11. tomcat1 192.168.250.41
  12. [root@client ~]# curl 192.168.250.101
  13. tomcat2 192.168.250.42
  15. [root@client ~]# curl 192.168.250.101
  16. tomcat3 192.168.250.43
  18. [root@client ~]# curl 192.168.250.102
  19. tomcat1 192.168.250.41
  20. [root@client ~]# curl 192.168.250.102
  21. tomcat2 192.168.250.42
  23. [root@client ~]# curl 192.168.250.102
  24. tomcat3 192.168.250.43
复制代码
测试乐成！！！
（3）测试三主热备架构

 将servera上的keepalived服务关闭，再去客户机上利用curl下令测试：
  2. [root@servera ~]# systemctl stop keepalived.service
复制代码
此时捏造ip消散，出现在serverc主机上：
  2. [root@servera ~]# ip ad
  3. 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
  4.     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
  5.     inet 127.0.0.1/8 scope host lo
  6.        valid_lft forever preferred_lft forever
  7.     inet6 ::1/128 scope host
  8.        valid_lft forever preferred_lft forever
  9. 2: ens160: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
  10.     link/ether 00:0c:29:ee:31:81 brd ff:ff:ff:ff:ff:ff
  11.     altname enp3s0
  12.     inet 192.168.250.30/24 brd 192.168.250.255 scope global noprefixroute ens160
  13.        valid_lft forever preferred_lft forever
  14.     inet6 fe80::20c:29ff:feee:3181/64 scope link noprefixroute
  15.        valid_lft forever preferred_lft forever
复制代码
  2. [root@serverc ~]# ip ad
  3. 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
  4.     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
  5.     inet 127.0.0.1/8 scope host lo
  6.        valid_lft forever preferred_lft forever
  7.     inet6 ::1/128 scope host
  8.        valid_lft forever preferred_lft forever
  9. 2: ens160: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
  10.     link/ether 00:0c:29:50:ff:3f brd ff:ff:ff:ff:ff:ff
  11.     altname enp3s0
  12.     inet 192.168.250.32/24 brd 192.168.250.255 scope global noprefixroute ens160
  13.        valid_lft forever preferred_lft forever
  14.     inet 192.168.250.102/32 scope global ens160
  15.        valid_lft forever preferred_lft forever
  16.     inet 192.168.250.100/32 scope global ens160
  17.        valid_lft forever preferred_lft forever
  18.     inet6 fe80::20c:29ff:fe50:ff3f/64 scope link noprefixroute
  19.        valid_lft forever preferred_lft forever
复制代码
利用curl测试：
  2. [root@client ~]# curl 192.168.250.100
  3. tomcat1 192.168.250.41
  4. [root@client ~]# curl 192.168.250.100
  5. tomcat2 192.168.250.42
  7. [root@client ~]# curl 192.168.250.100
  8. tomcat3 192.168.250.43
复制代码
同理将serverb上的keepalived服务关闭再检察捏造ip
  2. [root@serverb ~]# systemctl stop keepalived.service
  3. [root@serverb ~]# ip ad
  4. 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
  5.     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
  6.     inet 127.0.0.1/8 scope host lo
  7.        valid_lft forever preferred_lft forever
  8.     inet6 ::1/128 scope host
  9.        valid_lft forever preferred_lft forever
  10. 2: ens160: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
  11.     link/ether 00:0c:29:c2:e1:65 brd ff:ff:ff:ff:ff:ff
  12.     altname enp3s0
  13.     inet 192.168.250.31/24 brd 192.168.250.255 scope global noprefixroute ens160
  14.        valid_lft forever preferred_lft forever
  15.     inet6 fe80::20c:29ff:fec2:e165/64 scope link noprefixroute
  16.        valid_lft forever preferred_lft forever
复制代码
 此时的捏造ip全部在serverc上：
  2. [root@serverc ~]# ip ad
  3. 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
  4.     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
  5.     inet 127.0.0.1/8 scope host lo
  6.        valid_lft forever preferred_lft forever
  7.     inet6 ::1/128 scope host
  8.        valid_lft forever preferred_lft forever
  9. 2: ens160: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
  10.     link/ether 00:0c:29:50:ff:3f brd ff:ff:ff:ff:ff:ff
  11.     altname enp3s0
  12.     inet 192.168.250.32/24 brd 192.168.250.255 scope global noprefixroute ens160
  13.        valid_lft forever preferred_lft forever
  14.     inet 192.168.250.102/32 scope global ens160
  15.        valid_lft forever preferred_lft forever
  16.     inet 192.168.250.100/32 scope global ens160
  17.        valid_lft forever preferred_lft forever
  18.     inet 192.168.250.101/32 scope global ens160
  19.        valid_lft forever preferred_lft forever
  20.     inet6 fe80::20c:29ff:fe50:ff3f/64 scope link noprefixroute
  21.        valid_lft forever preferred_lft forever
复制代码
再在客户端上测试DNS轮询检察是否乐成：
  2. [root@client ~]# curl 192.168.250.100
  3. tomcat1 192.168.250.41
  4. [root@client ~]# curl 192.168.250.100
  5. tomcat2 192.168.250.42
  7. [root@client ~]# curl 192.168.250.100
  8. tomcat3 192.168.250.43
  9. [root@client ~]# curl 192.168.250.101tomcat1 192.168.250.41[root@client ~]# curl 192.168.250.101tomcat2 192.168.250.42[root@client ~]# curl 192.168.250.101tomcat3 192.168.250.43[root@client ~]# curl 192.168.250.102tomcat1 192.168.250.41[root@client ~]# curl 192.168.250.102tomcat2 192.168.250.42[root@client ~]# curl 192.168.250.102tomcat3 192.168.250.43
复制代码
测试乐成！！！！三主热备架构高可用搭建完成！！！
6、总结

在本次实验中，最须要留意的就是keepalived的设置文件，由于有三个捏造ip以是优先级，肯定要按序次写，一共是三组，如果逻辑头脑不强的同砚可以现在记事本中分好组再写入设置文件，以免出现keepalived设置文件堕落导致keepalived服务启动失败的错误。别的还要留意高可用的脚本，语法精确否则高可用会失败。

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