Modify hosts file and hostname: easily realize domain name and IP address mapping

Table of Contents

1. Modify the hosts file. The hosts file is a LINUX configuration file under /etc. Delete the directory and record the IP address corresponding to the domain name or host name. Every computer on the Internet will have an IP address, which is similar to a specific door steel number. This machine can be accessed through the IP address. However, it is difficult to remember the IP addressLinux hosts file modification, so you can use the method of mapping the IP address with the domain name to access the specific host by accessing the domain name. The hosts file records this mapping relationship. Change hosts:

, first ping Baidu and get an ipvim/etc/hosts

, put the IP copied above into hosts where baidubaidu1 leads to the previous IP

2. Modify hostname. Hostname is the hostname of this machine. When managing multiple machines, it is easier to distinguish and check the hostname: hostname

Temporarily change hostname: hostname new name,

, these methods are to temporarily change the linux hosts file modification, you can also pass sysctlhostname=new name,

, these changes will not be displayed in the host name in this terminal, you can see it by opening another terminal

, the host name has been changed. Change the host name permanently: vim/etc/sysconfig/network--》

Linux command list, just change the HOSTNAME value. The computer needs to be restarted. When the system starts, it will read the HOSTNAME in /etc/sysconfig/network and write it to /proc/sys/kernel/hostname as the current host name. The above sysctl changes the current host name, that is, The value of /proc/sys/kernel/hostname. 3. Grant root permissions. Sometimes it is necessary to grant root permissions to ordinary users and allow them to use some root commands. At this time, the sudoer file can be changed so that some users can use sudo to execute the root command useraddchicken to create a new ordinary user chicken and passwdchicken to set chicken. Password vim/etc/sudoers change sudoer file

, add a line of chicken to make the configuration take effect in source/etc/sudoers and then switch the user suchchicken

Unable to execute yum without root identity,

, sudoyum can be used 4. Linux firewall to check the firewall status serviceiptablesstatus, temporarily turn off, start and restart the firewall serviceiptablesstop|start|restart to check the manual start status of the firewall

Turn off and enable firewall auto-start chkconfigiptablesoff|on

5. Open the port vim/etc/sysconfig/itpables and change the iptables configuration file if you want to open the redis port 6379

, add a line to serviceiptablesreload

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