基于CentOS的企业架构规划及服务器优化参数

/etc/init.d/network restart

#!/bin/bash
#################################################
#    File Name: optimize-init_sys.sh
#       Author: Energy
#         Mail: admin@znix.top
#     Function: system optimize scripts
#################################################
#optimization linux system
. /etc/init.d/functions
 
#change system directory: create seripts/software directory
function change_dir(){
    ShellDir="/server/scripts"
    SoftwareDir="/server/tools"
    mkdir -p $ShellDir &&\
    mkdir -p $SoftwareDir
}
 
# input info verify
function info_verify(){read -p "Please make sure the information you entered (yes|no):" info
  case "$info" in
        y*|Y*)
            continue
            ;;
        n*|N*)
            exit 1
          ;;
  esac
}
 
#change system hostname
function change_hostname(){
    read -p "Please input hostname:" HostName
        info_verify
    hostname $HostName &&\
    sed -i "2s/=.*$/=$HostName/g" /etc/sysconfig/network &&\
    chk_hosts=$(grep -o "\b$HostName\b" /etc/hosts)
    get_ip=$(ifconfig eth0|awk -F "[ :]+" 'NR==2 {print $4}')
    if [-z $chk_hosts]
    then
        echo "$get_ip   $HostName" >>/etc/hosts
    else
        continue
    fi
}
 
#boot system optimize: setup chkconfig
function change_chkconfig(){
    Boot_options="$1"
    for boots in `chkconfig --list|grep "3:on"|awk '{print $1}'|grep -vE "$Boot_options"`
    do
        chkconfig $boots off
    done
}
 
#setup system optimize: setup ulimit
function change_ulimit(){
    grep "*       -       nofile       65535" /etc/security/limits.conf >/dev/null 2>&1
    if [$? -ne 0]
    then
        echo '*       -       nofile       65535' >>/etc/security/limits.conf
    fi
}
 
#setup system optimize: setup sysctl
function change_sysctl(){
    cat /tmp/sysctl.conf >/etc/sysctl.conf &&\
    modprobe bridge &>/dev/null &&\
    sysctl -p &>/dev/null
}
 
#sshd software optimize: change sshd_conf
function change_sshdfile(){
    SSH_Port="port 22"
    SSH_ListenAddress=$(ifconfig eth0|awk -F "[ :]+" 'NR==2 {print $4}')
    SSH_PermitRootLogin="PermitRootLogin no"
    SSH_PermitEmptyPassword="PermitEmptyPasswords no"
    SSH_GSSAPI="GSSAPIAuthentication no"
    SSH_DNS="useDNS no"
      #sed -i -e "13s/.*/$SSH_Port/g" /etc/ssh/sshd_config
      #sed -i -e "15s/.*/ListenAddress $SSH_ListenAddress/g" /etc/ssh/sshd_config
      #sed -i -e "42s/.*/$SSH_PermitRootLogin/g" /etc/ssh/sshd_config
      #sed -i -e "65s/.*/$SSH_PermitEmptyPassword/g" /etc/ssh/sshd_config
      sed -i -e "81s/.*/$SSH_GSSAPI/g" /etc/ssh/sshd_config
      sed -i -e "122s/.*/$SSH_DNS/g" /etc/ssh/sshd_config
}
 
#selinux software optimize: change disable
function change_selinux(){
    sed -i 's#SELINUX=.*#SELINUX=disabled#g' /etc/selinux/config &&\
    setenforce 0
}
 
#firewall software optimize: change stop
function change_firewall(){/etc/init.d/iptables stop >/dev/null 2>&1}
 
#crond software optimize: time synchronization
function change_update(){
    grep -i "#crond-id-001" /var/spool/cron/root >/dev/null 2>&1
    if [$? -ne 0]
    then
        echo '#crond-id-001:time sync by hq' >>/var/spool/cron/root
        echo "*/5 * * * * /usr/sbin/ntpdate time.nist.gov >/dev/null 2>&1">>/var/spool/cron/root
    fi
}
 
#update yum info
function update_yum(){
    wget -q -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo
    wget -q -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-6.repo
}
 
#change profile file info
function change_profile(){
    grep "PS1" /etc/profile >>/dev/null 2>&1
    if [$? -ne 0]
    then
        echo  "PS1='\[\e[32;1m\][\u@\h \W]\\$ \[\e[0m\]'" >>/etc/profile
    fi
    grep "alias grep" /etc/profile >>/dev/null 2>&1
    if [$? -ne 0]
    then
    echo "alias grep='grep --color=auto'" >>/etc/profile
    echo "alias ll='ls -l --color=auto --time-style=long-iso'" >>/etc/profile
    fi
    source /etc/profile
}
 
function main(){
    change_dir
    change_hostname
    change_chkconfig "crond|network|rsyslog|sshd|sysstat"
    change_ulimit
    change_sysctl
    change_sshdfile
    change_selinux
    change_firewall
    change_update
    update_yum
    change_profile
}
main
action "system optimize complete" /bin/true

mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo
wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-6.repo

sed -i 's#SELINUX=enforcing#SELINUX=disabled#g'  /etc/selinux/config
grep SELINUX=disabled /etc/selinux/config
setenforce 0
getenforce

/etc/init.d/iptables stop
/etc/init.d/iptables stop
chkconfig iptables off

chkconfig |egrep -v "sshd|network|crond|rsyslog|sysstat"|awk '{print"chkconfig",$1,"off"}'|bash
export LANG=en
chkconfig --list|grep 3:on

useradd oldboy
\cp /etc/sudoers /etc/sudoers.ori
echo "oldboy ALL=(ALL)  NOPASSWD: ALL" >>/etc/sudoers
tail -1 /etc/sudoers
visudo -c

cp /etc/sysconfig/i18n /etc/sysconfig/i18n.ori
echo 'LANG="zh_CN.UTF-8"' >/etc/sysconfig/i18n
source /etc/sysconfig/i18n
echo $LANG

echo '#time sync by hzs at 2017-10-05' >>/var/spool/cron/root
echo '*/5 * * * * /usr/sbin/ntpdate ntp1.aliyun.com >/dev/null  2>&1'>>/var/spool/cron/root
crontab -l

#echo 'export TMOUT=300' >>/etc/profile
#echo 'export HISTSIZE=5' >>/etc/profile
#echo 'export HISTFILESIZE=5' >>/etc/profile
#tail -3 /etc/profile
#./etc/profile

echo '*        -    nofile     65535'>>/etc/security/limits.conf
tail -1 /etc/security/limits.conf

cat >>/etc/sysctl.conf<<EOF
##youhua
net.ipv4.tcp_fin_timeout = 2
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_syncookies = 1 
net.ipv4.tcp_keepalive_time = 600
net.ipv4.ip_local_port_range = 4000 65000
net.ipv4.tcp_max_syn_backlog = 16384
net.ipv4.tcp_max_tw_buckets = 36000
net.ipv4.route.gc_timeout = 100
net.ipv4.tcp_syn_retries = 1
net.ipv4.tcp_synack_retries = 1
net.core.somaxconn = 16384
net.core.netdev_max_backlog = 16384
net.ipv4.tcp_max_syn_backlog = 16384
##iptables  youhua
net.nf_conntrack_max = 25000000
net.netfilter.nf_conntrack_max = 25000000
net.netfilter.nf_conntrack_tcp_timeout_established = 180
net.netfilter.nf_conntrack_tcp_timeout_time_wait = 120
net.netfilter.nf_conntrack_tcp_timeout_close_wait = 60
net.netfilter.nf_conntrack_tcp_timeout_fin_wait = 120
EOF

sysctl -p

yum install lrzsz namp tree  dos2unix nc -y

#yum update 或  yum upgrade
#yum -y update   #升级所有包，改变软件设置和系统设置，系统版本内核都升级
#yum -y ipgrade  #升级所有包，不改变系统设置和软件设置，系统版本升级，内核不变 

cat >/etc/hosts<<EOF
 
127.0.0.1     localhost localhost.localdomain localhost4 localhost4.localdomain4
 
::1           localhost localhost.localdomain localhost6 localhost6.localdomain6
172.16.1.5    lb01
172.16.1.6    lb02
172.16.1.7    web02
172.16.1.8    web01
172.16.1.9    web03
172.16.1.51   db01 db01.etiantian.org
172.16.1.31   nfs01
172.16.1.41   backup
172.16.1.61   m01
EOF

>/etc/udev/rules.d/70-persistent-net.rules

sed -ri '/HWADDR|UUID/d' /etc/sysconfig/network-scripts/ifcfg-eth[01]

shutdown -h now

hostname backup
sed -i "s#oldboy40#backup#g" /etc/sysconfig/network
grep "backup" /etc/sysconfig/network
HOSTNAME=backup
grep "backup" /etc/hosts
172.16.1.41     backup

sed -i 's#200#41#g'  /etc/sysconfig/network-scripts/ifcfg-eth[01]

hostname backup
sed -i  's#znix#backup#g' /etc/sysconfig/network
修改 hosts 文件 

/etc/init.d/network restart

yum -y install setuptool  
#安装 setup 命令工具
 
yum -y install ntsysv  
#安装 setup 工具配套的系统服务组件
 
yum -y install system-config-securitylevel-tui
#安装 setup 工具配套的防火墙配置组件
 
yum -y install system-config-network-tui
#安装 setup 工具配套的网络配置组件
 
yum -y install authconfig-gtk
#安装 setup 工具配套的验证配置组件
 
yum -y install system-config-keyboard
#安装 setup 工具配套的键盘配置组件 

Traceback (most recent call last):
  File "/usr/bin/system-config-firewall-tui", line 29, in <module>
    import fw_tui
  File "/usr/share/system-config-firewall/fw_tui.py", line 34, in <module>
    import fw_nm
  File "/usr/share/system-config-firewall/fw_nm.py", line 30, in <module>
    bus = dbus.SystemBus()
  File "/usr/lib/python2.6/site-packages/dbus/_dbus.py", line 202, in __new__    private=private)
  File "/usr/lib/python2.6/site-packages/dbus/_dbus.py", line 108, in __new__
    bus = BusConnection.__new__(subclass, bus_type, mainloop=mainloop)
  File "/usr/lib/python2.6/site-packages/dbus/bus.py", line 125, in __new__
    bus = cls._new_for_bus(address_or_type, mainloop=mainloop)
dbus.exceptions.DBusException: org.freedesktop.DBus.Error.FileNotFound: Failed to connect to socket /var/run/dbus/system_bus_socket: No such file or directory

yum install -y system-config-firewall system-config-firewall-tui dbus eggdbus && service messagebus start