Linux-命令记录-02

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去除文件空行和#开头的行

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grep ^[^#] file
grep -Ev "^$|[#;]"  file
egrep -v "^$|#"  file

修改文件最大打开数

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ulimit -n 1048576
sed -i "/nofile/d" /etc/security/limits.conf
echo "* hard nofile 1048576" >> /etc/security/limits.conf
echo "* soft nofile 1048576" >> /etc/security/limits.conf
echo "root hard nofile 1048576" >> /etc/security/limits.conf
echo "root soft nofile 1048576" >> /etc/security/limits.conf

优化ssh

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vim /etc/ssh/sshd_config
Port 52113                 #10000以上的端口
PermitRootLogin no         #禁止root远程登录
PermitEmptyPasswords no    #禁止空密码登录
UseDNS no                  #不使用解析。
GSSAPIAuthentication no    #连接慢的解决配置。

#检查sshd语法
sshd -t  

#重启ssh
service sshd restart

Centos常用包

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yum install -y libxml2 libxml2-devel openssl \
openssl-devel bzip2 bzip2-devel libcurl \
libcurl-devel libjpeg libjpeg-devel \
libpng libpng-devel freetype freetype-devel \
gmp gmp-devel libmcrypt libmcrypt-devel \
readline readline-devel libxslt libxslt-devel  \
libicu-devel  openldap  openldap-devel \
make zlib zlib-devel gcc-c++ libtool \
pcre pcre-devel  cmake gcc  ncurses ncurses-devel \
bison bison-devel libgcrypt perl