Common commands and actions under centos6.5

Overview of this chapter:

• Configure IP address under 1.linux system
• Install JDK under 2.linux System and configure environment variables
• Install Tomcat under 3.linux System and configure environment variables
• Install SSH remote Login tool under 4.linux System and implement password-free login
• Operation on the firewall under the 5.linux system

Configure IP address under 1.linux system

Install JDK under 2.linux System and configure environment variables

2.1 Uninstalling the Open JDK

Rpm-qa | grep java
RPM-E--nodeps Tzdata-java-2012c-1.el6.noarch
RPM-E--nodeps java-1.7.0-openjdk-1.7.0.45-1.45.1.11.1.el6.x86_64

2.2 Install JDK, configure environment variables under/etc/profile file, and take effect immediately

java_home=/usr/java/jdk1.7.0_79
Jre_home=/usr/java/jdk1.7.0_79/jre
Path= $PATH: $JAVA _home/bin: $JRE _home/bin
Classpath=.: $JAVA _home/lib/dt.jar: $JAVA _home/lib/tools.jar: $JRE _home/lib
Export Java_home jre_home PATH CLASSPATH

Source/etc/profile

Install Tomcat under 3.linux System and configure environment variables

Unzip the Tomcat compressed file and add the catalina_home=/usr/local/apache-tomcat-6.0.30/after the catalina.sh file

Install SSH remote Login tool under 4.linux System and implement password-free login

4.1 Viewing OpenSSH installation conditions
Rpm-qa | grep ssh
4.2 If not installed
Yum Install Openssh-server
Yum Install openssh-clients
4.3 Restarting ssh
     service sshd restart
4.4 setting on auto-start
      chkconfig sshd on
     chkconfig--list sshd
     4.5 generate secret key
     ssh-keygen-t RSA
     4.6 Create a new Authorized_keys file in the. ssh file, add each machine's public key to the Authorized_keys file, and distribute it to each machine to
4.7 assigns 600 permissions to Authorized_keys files
      chmod authorized_keys

Operation on the firewall under the 5.linux system

#查看防火墙状态
Service Iptables Status
#关闭防火墙
Service Iptables Stop
#查看防火墙开机启动状态
Chkconfig iptables--list
#关闭防火墙开机启动
Chkconfig iptables off

Common commands and actions under centos6.5