Linux system optimization

(Five days) Summary: How is the 1:linux system optimized?     1. Using aliases (alias)           alias   aliases           for root user, configure;          for normal users on/ROOT/.BASERC:/etc/profile or/etc/. BASERC configuration;          effective:source/etc/profile    2. Close selinux                3.setenforece    1 enabled; 0 (warning, not enabled)         4.gereforce    See if SELinux changes are in effect     3. Using init 3        1. runsevel    View current system operating level         2.init 3    4. Boot from         1.chkconfig   -list    View         3.chkconfig  sshd on/off     5. Time and online         1.date    Show time         & nbsp;       date-s  &nbsP Modified time         2.ntpdate time.nist.gov    Show time         & nbsp;       ntpdate time.nist.gov  >/dev/null 2>&1    Do not display on screen     6. Modify the configuration of sshd (port; disable root user ...)             1, to back up the/etc/ssh/sshd_config configuration files before the system configuration operation         & nbsp   2, content to be modified                 port    default is 22       & nbsp         permitrootlogin      allow root telnet             &NBSP ;   permitemptypasswords    allow blank password login                 usedns  &NB Sp If you are using dns           3, modify the system configuration file to restart the service.            4, disconnecting an already connected SSH connection, verifying the success of the configuration                        7.yum Source Update           1. Go to NetEase cloud image with     8. Hide Linux Landing version information            1. Command:>/etc/issue.net    9.history Display quantity            & nbsp     1. Set Linux default history number               command: Export histsize=5   & nbsp Put it on the/etc/profile, and take effect forever.           2. Set the history of ~/.bash_history               Command: Expor histfilesize=5      placed in/etc/profile, permanently effective.      10. Time Out and exit         1.export tmout 300         2.echo "Export tmout" >>/etc/profile        3.source/etc/profile    11. Character set encoding           1. Backup cp            2. Modify the Sed-i ' s#lang= ' en_US. Utf-8#lang= "ZH_CN. Utf-8#g '/etc/sysconfig/i18n          3. Make configuration effective source/etc/sysconfig/i18n          4.   View Code echo $LANG     12. Lock critical system files against tampering          1. Command: Chattr + I file         2. Release command: Chattr-i file   you is made of what does!!!!!!!!    -------kay 

Linux system optimization