JT-day09

1、Nginx Attribute specification

1.1 down attribute

explain : If the server goes down , Or the server doesn't want to continue serving users , You can use shutdown Attribute to identify
nginx Access rules : If nginx The server being accessed is not responding properly , Is waiting for Overtime after , Access to the new server

# To configure tomcat Server cluster   1. Default   Polling strategy   2. Weight strategy   3.ip_hash Strategy 
    upstream jtWindows {
        #ip_hash;
        server 127.0.0.1:8081 down;
        server 127.0.0.1:8082;
        server 127.0.0.1:8083;
    }

1.2 backup attribute

explain :backup Stand by machine . Under normal circumstances , The server will not serve users . But when the server goes down , Or when the server is busy , To access the server

# To configure tomcat Server cluster   1. Default   Polling strategy   2. Weight strategy   3.ip_hash Strategy 
    upstream jtWindows {
        #ip_hash;
        server 127.0.0.1:8081 down;
        server 127.0.0.1:8082 down;
        server 127.0.0.1:8083 backup;
    }

1.3 tomcat Server High Availability Mechanism

High availability : When the server fails , Through some mechanism, we can Automatic implementation Fault migration , So that users will not be affected by any

# To configure tomcat Server cluster   1. Default   Polling strategy   2. Weight strategy   3.ip_hash Strategy 
    upstream jtWindows {
        #ip_hash;     down  Identify downtime      backup  Spare machine 
        #max_fails=1           The maximum number of failures 
        #fail_timeout=60s     If there's no access , It's in 60 Seconds , No more access to the malfunctioning machine 
        server 127.0.0.1:8081 max_fails=1 fail_timeout=60s;
        server 127.0.0.1:8082 max_fails=1 fail_timeout=60s;
        server 127.0.0.1:8083 max_fails=1 fail_timeout=60s;
    }

2、 About virtual machines

2.1 Modify virtual machine IP Address

1. modify IP Section

2. Check the gateway address

3. Set up IP lease

Check IP Address

command : ip addr
without IP The display performs the following commands

service NetworkManager stop 
chkconfig  NetworkManager  off     Permanent ban  Manager network card 
service  network restart           restart network network card 

2.2 Remote server connection

3、Linux Environment building

3.1 install JDK

3.1.1 Upload JDK file

3.1.2 decompression JDK

3.1.3 Mobile installation package

Mobile installation package

[root@localhost src]# mv jdk-8u51-linux-x64.tar.gz              software/

3.1.4 Modify file name

[root@localhost src]# mv jdk1.8.0_51         jdk1.8

3.1.5 To configure JDK environment variable

File directory : /etc/profile
Edit the file : vim /etc/profile

Let the environment variables take effect source /etc/profile