Configure high availability using virtual ip+kept

Environmental statement

1. centos 7 ,keepalived-2.0.20 .
2. master ip ：192.168.1.26 backup ip : 192.168.1.33
3. vip ：192.168.1.50 （ This is what we will create next ip）
4. The environment I use is local area network , So I didn't test the public network environment , But the principle is the same , Nothing more than virtual ip The creation location is different .
   
   

1. Create virtual ip(virtual ip)

• I'm using centos Environment , If you are ubuntu Or other systems , Please refer to the right
  It should be virtual ip Set up ！
  
  

Master part

1. Check the network port of the virtual machine     command ： ip addr
   

• Pay attention to the information in the red box , Don't care about anything else .
  

2. Enter the command ：cd /etc/sysconfig/network-scripts/
   
3. Enter the command ：ls
   
   My Internet port is ens33, So my corresponding Internet port file is ifcfg-ens33, That's me ip by 192.168.1.26 Configuration file for
   
4. Enter the command ：vim ifcfg-ens33
   Fill in the first red box with your local ip（ Is what you are using IP Address ）
   The next two red boxes are the virtual you want to add IP Address （ Note that the network segment address should be consistent with your local network segment ）

Back UP part

• Back Up Some are special , There is no need to configure virtual IP, Just install keepalived after , stay keepalived.conf Configure the corresponding... In the file IP Just fine

2. install keepalived（ Source code installation ）

Master part

1. keepalived Official website address （ I'm using 2.0.20）
   
   
2. Compilation and installation
   1. Remove the compressed package from windows Put in Linux System
   2. tar -xvf keepalived-2.0.20.tar.gz
   3. ./configure --prefix=/usr/local/keepalived-1.2.15 （ Notice that there is only one ahead .）
   4. make && make install
   5. Wait for compilation and installation to complete
      
      
3. modify keepalived.conf
   1. Because we didn't specify anything extra in the compilation and installation , So this conf The file is usually in /etc/keepalived/
   2. cd /etc/keepalived/
   3. vim keepalived.conf
      
      

I'm posted here master Part of the keepalived.conf To configure （ All that need to be used have been annotated ," # " Is the annotation identifier ）

! Configuration File for keepalived

global_defs {
    
   #  When it breaks down , Notification of active / standby switchover email

   #notification_email {
    
     #[email protected]
     #[email protected]
     #[email protected]
   #}
   # email To configure 
   #notification_email_from [email protected]
   #smtp_server 192.168.200.1
   #smtp_connect_timeout 30、

   #  route id, Current installation keepalived Node host identifier , It is necessary to ensure global uniqueness 
   router_id keep_1
   #router_id LVS_DEVEL
   #vrrp_skip_check_adv_addr
   #vrrp_strict
   #vrrp_garp_interval 0
   #vrrp_gna_interval 0
}


#  be based on vrrp Examples of agreements , It can be understood as a server node 
vrrp_instance VI_1 {
    
    #  Indicates that the status is the primary node MASTER Or standby BACKUP
    state MASTER
    #  The network card bound by the current example , according to ip addr The network card found 
    interface ens33
    #  Virtual routing id  It is necessary to ensure that the value of the primary and standby nodes is consistent 
    virtual_router_id 51
    # priority / The weight ,master The weight is generally higher than backup, stay master Who has the highest priority after hanging up , Who can be master
    priority 188
    # The time interval of synchronous check between active and standby （ heartbeat ）, The default is 1s
    advert_int 1
    # Authentication authorization password , Prevent illegal nodes from entering , The active and standby need to be consistent 
    authentication {
    
        auth_type PASS
        auth_pass 1111
    }
    # fictitious IP, There can be multiple , Modify... According to your actual situation 
    virtual_ipaddress {
    
        192.168.1.50
    }
}

# virtual_server 192.168.200.100 443 {
    
# delay_loop 6
# lb_algo rr
# lb_kind NAT
# persistence_timeout 50
# protocol TCP

# real_server 192.168.201.100 443 {
    
# weight 1
# SSL_GET {
    
# url {
    
# path /
# digest ff20ad2481f97b1754ef3e12ecd3a9cc
# }
# url {
    
# path /mrtg/
# digest 9b3a0c85a887a256d6939da88aabd8cd
# }
# connect_timeout 3
# retry 3
# delay_before_retry 3
# }
# }
# }

# virtual_server 10.10.10.2 1358 {
    
# delay_loop 6
# lb_algo rr
# lb_kind NAT
# persistence_timeout 50
# protocol TCP

# sorry_server 192.168.200.200 1358

# real_server 192.168.200.2 1358 {
    
# weight 1
# HTTP_GET {
    
# url {
    
# path /testurl/test.jsp
# digest 640205b7b0fc66c1ea91c463fac6334d
# }
# url {
    
# path /testurl2/test.jsp
# digest 640205b7b0fc66c1ea91c463fac6334d
# }
# url {
    
# path /testurl3/test.jsp
# digest 640205b7b0fc66c1ea91c463fac6334d
# }
# connect_timeout 3
# retry 3
# delay_before_retry 3
# }
# }

# real_server 192.168.200.3 1358 {
    
# weight 1
# HTTP_GET {
    
# url {
    
# path /testurl/test.jsp
# digest 640205b7b0fc66c1ea91c463fac6334c
# }
# url {
    
# path /testurl2/test.jsp
# digest 640205b7b0fc66c1ea91c463fac6334c
# }
# connect_timeout 3
# retry 3
# delay_before_retry 3
# }
# }
# }

# virtual_server 10.10.10.3 1358 {
    
# delay_loop 3
# lb_algo rr
# lb_kind NAT
# persistence_timeout 50
# protocol TCP

# real_server 192.168.200.4 1358 {
    
# weight 1
# HTTP_GET {
    
# url {
    
# path /testurl/test.jsp
# digest 640205b7b0fc66c1ea91c463fac6334d
# }
# url {
    
# path /testurl2/test.jsp
# digest 640205b7b0fc66c1ea91c463fac6334d
# }
# url {
    
# path /testurl3/test.jsp
# digest 640205b7b0fc66c1ea91c463fac6334d
# }
# connect_timeout 3
# retry 3
# delay_before_retry 3
# }
# }

# real_server 192.168.200.5 1358 {
    
# weight 1
# HTTP_GET {
    
# url {
    
# path /testurl/test.jsp
# digest 640205b7b0fc66c1ea91c463fac6334d
# }
# url {
    
# path /testurl2/test.jsp
# digest 640205b7b0fc66c1ea91c463fac6334d
# }
# url {
    
# path /testurl3/test.jsp
# digest 640205b7b0fc66c1ea91c463fac6334d
# }
# connect_timeout 3
# retry 3
# delay_before_retry 3
# }
# }
# }

BackUp part

1. keepalived Official website address （ I'm using 2.0.20）
   
   
2. Compilation and installation
   1. Remove the compressed package from windows Put in Linux System
   2. tar -xvf keepalived-2.0.20.tar.gz
   3. ./configure --prefix=/usr/local/keepalived-1.2.15 （ Notice that there is only one ahead .）
   4. make && make install
   5. Wait for compilation and installation to complete
      
      
3. modify keepalived.conf
   1. Because we didn't specify anything extra in the compilation and installation , So this conf The file is usually in /etc/keepalived/
   2. cd /etc/keepalived/
   3. vim keepalived.conf
      
      

I'm posted here BackUp Part of the keepalived.conf To configure （ All that need to be used have been annotated ," # " Is the annotation identifier ）

! Configuration File for keepalived

global_defs {
    
  # notification_email {
    
  # [email protected]
  # [email protected]
  # [email protected]
  # }
  # notification_email_from [email protected]
  # smtp_server 192.168.200.1
  # smtp_connect_timeout 30
  # router_id LVS_DEVEL
  # vrrp_skip_check_adv_addr
  # vrrp_strict
  # vrrp_garp_interval 0
  # vrrp_gna_interval 0
}

vrrp_instance VI_1 {
    
    state MASTER
    interface ens33
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
    
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
    
        # 192.168.200.16
        # 192.168.200.17
        # 192.168.200.18
        192.168.1.50
    }
}

# virtual_server 192.168.200.100 443 {
    
# delay_loop 6
# lb_algo rr
# lb_kind NAT
# persistence_timeout 50
# protocol TCP

# real_server 192.168.201.100 443 {
    
# weight 1
# SSL_GET {
    
# url {
    
# path /
# digest ff20ad2481f97b1754ef3e12ecd3a9cc
# }
# url {
    
# path /mrtg/
# digest 9b3a0c85a887a256d6939da88aabd8cd
# }
# connect_timeout 3
# retry 3
# delay_before_retry 3
# }
# }
# }

# virtual_server 10.10.10.2 1358 {
    
# delay_loop 6
# lb_algo rr
# lb_kind NAT
# persistence_timeout 50
# protocol TCP

# sorry_server 192.168.200.200 1358

# real_server 192.168.200.2 1358 {
    
# weight 1
# HTTP_GET {
    
# url {
    
# path /testurl/test.jsp
# digest 640205b7b0fc66c1ea91c463fac6334d
# }
# url {
    
# path /testurl2/test.jsp
# digest 640205b7b0fc66c1ea91c463fac6334d
# }
# url {
    
# path /testurl3/test.jsp
# digest 640205b7b0fc66c1ea91c463fac6334d
# }
# connect_timeout 3
# retry 3
# delay_before_retry 3
# }
# }

# real_server 192.168.200.3 1358 {
    
# weight 1
# HTTP_GET {
    
# url {
    
# path /testurl/test.jsp
# digest 640205b7b0fc66c1ea91c463fac6334c
# }
# url {
    
# path /testurl2/test.jsp
# digest 640205b7b0fc66c1ea91c463fac6334c
# }
# connect_timeout 3
# retry 3
# delay_before_retry 3
# }
# }
# }

# virtual_server 10.10.10.3 1358 {
    
# delay_loop 3
# lb_algo rr
# lb_kind NAT
# persistence_timeout 50
# protocol TCP

# real_server 192.168.200.4 1358 {
    
# weight 1
# HTTP_GET {
    
# url {
    
# path /testurl/test.jsp
# digest 640205b7b0fc66c1ea91c463fac6334d
# }
# url {
    
# path /testurl2/test.jsp
# digest 640205b7b0fc66c1ea91c463fac6334d
# }
# url {
    
# path /testurl3/test.jsp
# digest 640205b7b0fc66c1ea91c463fac6334d
# }
# connect_timeout 3
# retry 3
# delay_before_retry 3
# }
# }

# real_server 192.168.200.5 1358 {
    
# weight 1
# HTTP_GET {
    
# url {
    
# path /testurl/test.jsp
# digest 640205b7b0fc66c1ea91c463fac6334d
# }
# url {
    
# path /testurl2/test.jsp
# digest 640205b7b0fc66c1ea91c463fac6334d
# }
# url {
    
# path /testurl3/test.jsp
# digest 640205b7b0fc66c1ea91c463fac6334d
# }
# connect_timeout 3
# retry 3
# delay_before_retry 3
# }
# }
# }

• Be careful ： I have two here state All are MASTER, It's best to look at it carefully. I'm Master Of keepalived.conf Configuration and comments , Which is the main and which is the standby , Mainly weight value .

So far, we two Linux The virtual IP and keepalived Configuration and installation have been completed

3. test

Master and BackUp Follow the steps below

1. Enter the extracted Directory command ： cd keepalived-2.0.20/keepalived
2. start-up keepalived command ： ./keepalived
3. See if it started successfully command 1： ps -ef|grep keepalived
4. See if it started successfully command 2： systemctl status keepalived.service

command 1：

command 2：

5. Turn on Master and BackUp Of keepalived
6. Carry out orders ： journalctl -u keepalived （ see keepalived journal ）

• Master End log
  

• BackUp End log

Master ：Entering MASTER STATE

BackUp：Entering BACKUP STATE

These two sentences represent two Linux Switch between active and standby identities , I put it in private Master Linux After closing ,BackUp Linux You can switch to Master identity , When I am Master Linux After reopening , Will be able to Back Up Linux Of Master Get your identity back , The reason lies in the weight value and identity status

Common commands ：

• see keepalived state ：systemctl status keepalived.service
• stop it keepalived service ：systemctl stop keepalived.service
• Start keepalived service ：systemctl start keepalived.service