Linux operation and Architecture-linux Foundation optimization

1. View Linux Version

cat/etc/redhat-
6.9 (Final) ———— > view version number uname-m#x86_64                     ———— > View System 64-bit /32-bit uname-R  #2.6. -696. el6.x86_64      —————— > Kernel version

2. Close SELinux and Iptables

' s#=enforcing#=disabled#g ' /etc/selinux/0 # —————— > Temporary close getenforce/etc/init.d/iptables Stopchkconfig iptables off

3, change the character set, support Chinese, but do not recommend the best use of English character set, prevent garbled problem

Echo $LANGen _us. UTF-8             # —————— > See if the system character set is correct lang=enexport lang=en_us.utf8  # ————— >  "lang=en_us.utf8" >/etc/sysconfig/i18n # —————— >/etc/ sysconfig/i18n                  # —————— > immediately let the configuration file take effect

4. Streamlined boot-up service

Export lang=enchkconfig"crond|sshd|network|rsyslog|sysstat"'{ Print "Chkconfig", $ $, "off"}'|  3: On

5. Time synchronization

' #time Sync by Yanxinjiang at 2017-01-01 ' >>/var/spool/cron/'*/5 * * * */usr/sbin/ntpdate  pool.ntp.org >/dev/null 2>&1' >>/var/spool/cron/-L

6. Change the Yum source

Wget-o/etc/yum.repos.d/centos-base.repo  http://wget-o/etc/yum.repos.d/epel.repo http ://Mirrors.aliyun.com/repo/epel-6.repo

7. enlarge File Descriptor

' *               -       nofile          ' >>/etc/security/limits.conf

8. Linux kernel optimization

Cat >>/etc/sysctl.conf<<EOFnet.ipv4.tcp_fin_timeout=2Net.ipv4.tcp_tw_reuse=1net.ipv4.tcp_tw_recycle=1net.ipv4.tcp_syncookies=1Net.ipv4.tcp_keepalive_time= -Net.ipv4.ip_local_port_range=4000    65000Net.ipv4.tcp_max_syn_backlog=16384net.ipv4.tcp_max_tw_buckets=36000Net.ipv4.route.gc_timeout= -net.ipv4.tcp_syn_retries=1net.ipv4.tcp_synack_retries=1Net.core.somaxconn=16384Net.core.netdev_max_backlog=16384Net.ipv4.tcp_max_orphans=16384#以下参数是对iptables防火墙的优化, the firewall does not meet the prompts, can be ignored. Net.nf_conntrack_max=25000000Net.netfilter.nf_conntrack_max=25000000net.netfilter.nf_conntrack_tcp_timeout_established= thenet.netfilter.nf_conntrack_tcp_timeout_time_wait= -net.netfilter.nf_conntrack_tcp_timeout_close_wait= -net.netfilter.nf_conntrack_tcp_timeout_fin_wait= -Eofsysctl-P

9. SSH Connection speed optimization

' [email protected] #UseDNS [email protected] [email protected]; [Email protected]^gssapiauthentication [email protected] [email protected]'  /etc/ssh/sshd_ Config/etc/init.d/sshd Reload

10, Common gadget installation

Yum Install Lrzsz nmap Tree Dos2unix NC telnet-y

11, through the use of sudo to control the ordinary user management

123456|passwd--/etc/sudoers/etc/"oldboy  " >>/ etc/-1 /etc/-C

Linux operation and Architecture-linux Foundation optimization