Linux系统初始化脚本
#!/bin/bash #gcc install yum install -y gcc #vim install yum install -y vim #Development Tools yum groupinstall -y "Development Libraries" "Development Tools" # close iptables yum -y install iptables /etc/init.d/iptables stop /sbin/iptables -F service iptables save /etc/init.d/iptables stop chkconfig iptables off # disable ipv6 echo "alias net-pf-10 off" >> /etc/modprobe.conf echo "alias ipv6 off" >> /etc/modprobe.conf /sbin/chkconfig --level 35 ip6tables off echo "ipv6 is disabled!" #yum install yum install -y lrzsz yum -y install xfsdump yum -y install wget yum -y install redhat-lsb #disable selinux sed -i "s/SELINUX=enforcing/SELINUX=disabled/" /etc/selinux/config echo "selinux is disabled,you must reboot!" #modify timezone echo ‘y‘| cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime #sync time yum install -y ntp /usr/sbin/ntpdate ntp.api.bz > /dev/null 2>&1 echo "/usr/sbin/ntpdate ntp.api.bz > /dev/null 2>&1" >> /etc/rc.local echo "modprobe ip_conntrack > /dev/null 2>&1" >> /etc/rc.local #tunoff services for i in `ls /etc/rc3.d/S*` do CURSRV=`echo $i | cut -c 15-` echo $CURSRV case $CURSRV in crond | irqbalance | microcode_ctl | network | random | sendmail | sshd | syslog | local ) echo "Base services,skip!" ;; *) echo "change $CURSRV to off" chkconfig --level 235 $CURSRV off service $CURSRV stop ;; esac done echo "ulimit -SHn 65535" >> /etc/profile echo "* soft nofile 65536" >> /etc/security/limits.conf echo "* hard nofile 65536" >> /etc/security/limits.conf echo ‘‘>/etc/sysctl.conf cat >>/etc/sysctl.conf<<eof net.ipv4.ip_forward = 0 net.ipv4.conf.default.rp_filter = 1 net.ipv4.conf.default.accept_source_route = 0 kernel.sysrq = 0 kernel.core_uses_pid = 1 net.ipv4.tcp_syncookies = 1 kernel.msgmnb = 65536 kernel.msgmax = 65536 kernel.shmmax = 68719476736 kernel.shmall = 4294967296 net.ipv4.tcp_max_tw_buckets = 60000 net.ipv4.tcp_sack = 1 net.ipv4.tcp_window_scaling = 1 net.ipv4.tcp_rmem = 4096 87380 4194304 net.ipv4.tcp_wmem = 4096 16384 4194304 net.core.wmem_default = 8388608 net.core.rmem_default = 8388608 net.core.rmem_max = 16777216 net.core.wmem_max = 16777216 net.core.netdev_max_backlog = 262144 net.core.somaxconn = 262144 net.ipv4.tcp_max_orphans = 3276800 net.ipv4.tcp_max_syn_backlog = 262144 net.ipv4.tcp_timestamps = 0 net.ipv4.tcp_synack_retries = 1 net.ipv4.tcp_syn_retries = 1 net.ipv4.tcp_tw_recycle = 1 net.ipv4.tcp_tw_reuse = 1 net.ipv4.tcp_mem = 94500000 915000000 927000000 net.ipv4.tcp_fin_timeout = 1 net.ipv4.tcp_keepalive_time = 30 net.ipv4.ip_local_port_range = 1024 65000 fs.file-max = 102400 net.ipv4.ip_conntrack_max = 1048576 net.ipv4.netfilter.ip_conntrack_max = 131072 net.ipv4.netfilter.ip_conntrack_tcp_timeout_established = 216000 eof modprobe ip_conntrack sysctl -p #修改ssh默认dns解析 sed -i ‘/AddressFamily/ a\UseDNS no‘ /etc/ssh/sshd_config #添加默认lib库文件 touch /etc/ld.so.conf.d/default.conf echo "/usr/lib" >> /etc/ld.so.conf.d/default.conf echo "/usr/lib64" >> /etc/ld.so.conf.d/default.conf echo "/usr/local/lib" >> /etc/ld.so.conf.d/default.conf echo "/usr/local/lib64" >> /etc/ld.so.conf.d/default.conf ldconfig echo "初始化系统没有完成!"
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