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平时系统初始化用到的，记录一下.

# Linux硬件性能检测.

# Download and run:
  wget http://aspersa.googlecode.com/svn/trunk/summary
  ./summary

# 系统初始化.

cat << EOF
+---------------------------------------+
|  === CentOS System Init ===           |
|  OS: `cat /etc/redhat-release`        |
+---------------------------------------+
EOF

# Update yum.
cd /etc/yum.repos.d
mv CentOS-Base.repo  CentOS-Base.repo.bak
wget http://centos.ustc.edu.cn/CentOS-Base.repo.5
mv CentOS-Base.repo.5 CentOS-Base.repo

# Update system.
yum clean all
yum -y update glibc\*
yum -y update yum\* rpm\* python\*
yum clean all
yum -y update

# Enable ntp service.
\cp -f /usr/share/zoneinfo/America/Los_Angeles /etc/localtime
yum -y install ntp
/usr/sbin/ntpdate 0.pool.ntp.org > /dev/null 2>&1
hwclock -w
/etc/init.d/ntpd start
chkconfig --level 35 ntpd on
netstat -na | grep 123

# Set ulimit.
echo "ulimit -SHn 102400" >> /etc/rc.local
cat >> /etc/security/limits.conf << EOF
*           soft   nofile       65535
*           hard   nofile       65535
EOF

# Disable IPv6.
echo "alias net-pf-10 off" >> /etc/modprobe.conf
echo "alias ipv6 off" >> /etc/modprobe.conf
/sbin/chkconfig --level 35 ip6tables off

# Disable SElinux.
sed -i 's/SELINUX=.*/SELINUX=disabled/' /etc/sysconfig/selinux
#sed -i '/SELINUX/s/enforcing/disabled/' /etc/selinux/config
/usr/sbin/setenforce 0

# Disable crtl+alt+del.
sed -i 's@ca::ctrlaltdel:/sbin/shutdown -t3 -r now@#ca::ctrlaltdel:/sbin/shutdown -t3 -r now@' /etc/inittab
/sbin/init q

# Bashrc.
cat >> /root/.bashrc << "EOF"
PS1="\[\e[37;40m\][\[\e[32;40m\]\u\[\e[37;40m\]@\h \[\e[35;40m\]\W\[\e[0m\]]\\$ \[\e[33;40m\]"
EOF

# Vim.
sed -i "8 s/^/alias vi='vim'/" /root/.bashrc
cat >/root/.vimrc<<EOF
syntax on
set expandtab
set shiftwidth=4
set softtabstop=4
set tabstop=4
EOF

# Set locale.
#true > /etc/sysconfig/i18n
#cat >>/etc/sysconfig/i18n<<EOF
#LANG="zh_CN.GB18030"
#SUPPORTED="zh_CN.GB18030:zh_CN:zh:en_US.UTF-8:en_US:en"
#SYSFONT="latarcyrheb-sun16"
#EOF

# Zh_cn.
sed -i -e 's/^LANG=.*/LANG="en"/'   /etc/sysconfig/i18n
#sed -i -e 's/^LANG=.*/LANG="en_US.UTF-8"/'   /etc/sysconfig/i18n
#sed -i -e 's/^LANG=.*/LANG="zh_CN.GB18030"/'   /etc/sysconfig/i18n

# Set purview.
chmod 600 /etc/passwd
chmod 600 /etc/shadow
chmod 600 /etc/group
chmod 600 /etc/gshadow

# Init_ssh.
ssh_cf="/etc/ssh/sshd_config"
sed -i -e '74 s/^/#/' -i -e '76 s/^/#/' $ssh_cf
sed -i "s/#Port 22/Port 65535/" $ssh_cf
sed -i "s/#UseDNS yes/UseDNS no/" $ssh_cf
# Client.
sed -i -e '44 s/^/#/' -i -e '48 s/^/#/' $ssh_cf
/etc/init.d/sshd restart

# Turnoff services.
for i in `ls /etc/rc3.d/S*`
do
    CURSRV=$(echo $i | cut -c 15-)

    echo ${CURSRV}
    case ${CURSRV} in
        cpuspeed | crond | irqbalance | microcode_ctl | lvm2-monitor | network | random | readahead_early| sendmail | sshd | syslog | local )
	echo "Base services, Skip!"
        ;;
        *)
            echo "change ${CURSRV} to off"
            chkconfig --level 235 ${CURSRV} off
            service ${CURSRV} stop
            echo ""
            ;;
    esac
done
echo "Turning off Services: OK"

#------------------------------------------------------------------------------------------
# 优化Linux内核参数. Tune kernel config.
#------------------------------------------------------------------------------------------
# Set sysctl.
true > /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 = 6000
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

# TCP memory.
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_synack_retries = 1
net.ipv4.tcp_syn_retries = 1
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_timestamps = 0
net.ipv4.ip_local_port_range = 1024 65535
net.ipv4.tcp_mem = 94500000 915000000 927000000
net.ipv4.tcp_fin_timeout = 1
net.ipv4.tcp_keepalive_time = 1200
net.ipv4.tcp_tw_recycle = 1
EOF

/sbin/sysctl -p
echo "sysctl set OK!"

# Add 'epel' and 'remi' repo (for CentOS 5).
  echo -n "Installing the epel and remi yum repo: "
  rpm -i http://http://download.fedora.redhat.com/pub/epel/5/x86_64/epel-release-5-4.noarch.rpm >/dev/null 2>&1
  rpm -Uvh http://remi-mirror.dedipower.com/enterprise/remi-release-5.rpm

# (for CentOS 6).
  rpm -Uvh http://download.fedora.redhat.com/pub/epel/6/x86_64/epel-release-6-5.noarch.rpm
  rpm -Uvh http://remi-mirror.dedipower.com/enterprise/remi-release-6.rpm