脚本一:
1 #!/usr/bin/env bash
2
3 #设置环境变量
4 export PATH=$PATH:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
5
6 function kernel () {
7 echo "
8 #CTCDN系统优化参数
9 #关闭ipv6
10 net.ipv6.conf.all.disable_ipv6 = 1
11 net.ipv6.conf.default.disable_ipv6 = 1
12 #决定检查过期多久邻居条目
13 net.ipv4.neigh.default.gc_stale_time=120
14 #使用arp_announce / arp_ignore解决ARP映射问题
15 net.ipv4.conf.default.arp_announce = 2
16 net.ipv4.conf.all.arp_announce=2
17 net.ipv4.conf.lo.arp_announce=2
18 # 避免放大攻击
19 net.ipv4.icmp_echo_ignore_broadcasts = 1
20 # 开启恶意icmp错误消息保护
21 net.ipv4.icmp_ignore_bogus_error_responses = 1
22 #关闭路由转发
23 net.ipv4.ip_forward = 0
24 net.ipv4.conf.all.send_redirects = 0
25 net.ipv4.conf.default.send_redirects = 0
26 #开启反向路径过滤
27 net.ipv4.conf.all.rp_filter = 1
28 net.ipv4.conf.default.rp_filter = 1
29 #处理无源路由的包
30 net.ipv4.conf.all.accept_source_route = 0
31 net.ipv4.conf.default.accept_source_route = 0
32 #关闭sysrq功能
33 kernel.sysrq = 0
34 #core文件名中添加pid作为扩展名
35 kernel.core_uses_pid = 1
36 # 开启SYN洪水攻击保护
37 net.ipv4.tcp_syncookies = 1
38 #修改消息队列长度
39 kernel.msgmnb = 65536
40 kernel.msgmax = 65536
41 #设置最大内存共享段大小bytes
42 kernel.shmmax = 68719476736
43 kernel.shmall = 4294967296
44 #timewait的数量,默认180000
45 net.ipv4.tcp_max_tw_buckets = 6000
46 net.ipv4.tcp_sack = 1
47 net.ipv4.tcp_window_scaling = 1
48 net.ipv4.tcp_rmem = 4096 87380 4194304
49 net.ipv4.tcp_wmem = 4096 16384 4194304
50 net.core.wmem_default = 8388608
51 net.core.rmem_default = 8388608
52 net.core.rmem_max = 16777216
53 net.core.wmem_max = 16777216
54 #每个网络接口接收数据包的速率比内核处理这些包的速率快时,允许送到队列的数据包的最大数目
55 net.core.netdev_max_backlog = 262144
56 #限制仅仅是为了防止简单的DoS 攻击
57 net.ipv4.tcp_max_orphans = 3276800
58 #未收到客户端确认信息的连接请求的最大值
59 net.ipv4.tcp_max_syn_backlog = 262144
60 net.ipv4.tcp_timestamps = 0
61 #内核放弃建立连接之前发送SYNACK 包的数量
62 net.ipv4.tcp_synack_retries = 1
63 #内核放弃建立连接之前发送SYN 包的数量
64 net.ipv4.tcp_syn_retries = 1
65 #启用timewait 快速回收
66 net.ipv4.tcp_tw_recycle = 1
67 #开启重用。允许将TIME-WAIT sockets 重新用于新的TCP 连接
68 net.ipv4.tcp_tw_reuse = 1
69 net.ipv4.tcp_mem = 94500000 915000000 927000000
70 net.ipv4.tcp_fin_timeout = 1
71 #当keepalive 起用的时候,TCP 发送keepalive 消息的频度。缺省是2 小时
72 net.ipv4.tcp_keepalive_time = 1800
73 net.ipv4.tcp_keepalive_probes = 3
74 net.ipv4.tcp_keepalive_intvl = 15
75 #允许系统打开的端口范围
76 net.ipv4.ip_local_port_range = 1024 65000
77 #修改防火墙表大小,默认65536
78 net.netfilter.nf_conntrack_max=655350
79 net.netfilter.nf_conntrack_tcp_timeout_established=1200
80 # 确保无人能修改路由表
81 net.ipv4.conf.all.accept_redirects = 0
82 net.ipv4.conf.default.accept_redirects = 0
83 net.ipv4.conf.all.secure_redirects = 0
84 net.ipv4.conf.default.secure_redirects = 0" >> /etc/sysctl.conf
85
86 read -r -p "是否开启路由转发? [y|n] " input
87 case $input in
88 y)
89 sed -i "s#net.ipv4.ip_forward = 0#net.ipv4.ip_forward = 1#g" /etc/sysctl.conf
90 sed -i "s#net.ipv4.conf.all.send_redirects = 0#net.ipv4.conf.all.send_redirects = 1#g" /etc/sysctl.conf
91 sed -i "s#net.ipv4.conf.default.send_redirects = 0#net.ipv4.conf.default.send_redirects = 1#g" /etc/sysctl.conf
92 sysctl -p
93 echo "优化完成,程序退出"
94 ;;
95 n)
96 sysctl -p
97 echo "优化完成,程序退出"
98 exit
99 ;;
100 esac
101 }
102
103
104 # 是否优化内核
105 function openkernel () {
106 read -r -p "是否优化内核? [y/n] " input
107 case $input in
108 y)
109 kernel
110 ;;
111 n)
112 echo "优化完成,程序退出"
113 exit
114 ;;
115 esac
116 }
117
118
119 # 修改文件数限制
120 function openfile () {
121 read -r -p "是否修改打开文件数的限制? [y/n] " input
122 case $input in
123 y)
124 echo -e "* soft nofile 1024000\n* hard nofile 1024000\nhive - nofile 1024000\nhive - nproc 1024000" >> /etc/security/limits.conf
125 openkernel
126 ;;
127 n)
128 openkernel
129 ;;
130 esac
131 }
132
133
134 # 修改用户进程限制
135 function userlimits () {
136 read -r -p "是否加大普通用户限制? [y/n] " input
137 case $input in
138 y)
139 sed -i 's#4096#65535#g' /etc/security/limits.d/20-nproc.conf
140 openfile
141 ;;
142 n)
143 openfile
144 ;;
145 esac
146 }
147
148
149 # 修改主机名
150 function hostname () {
151 read -r -p "是否要修改主机名? [y/n]" input
152 case $input in
153 y)
154 read -r -p "请输入主机名:" hostname
155 hostnamectl set-hostname $hostname
156 userlimits
157 ;;
158 n)
159 userlimits
160 ;;
161 esac
162 }
163
164
165
166 # 基础优化函数
167 function All () {
168 yum -y install epel-release
169 yum update
170 yum -y install net-tools tree lrzsz unzip telnet vim gcc cmake wget git ntpdate bash-completion
171 sed -i "/^SELINUX/s#enforcing#disabled#g" /etc/selinux/config
172 cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
173 echo -e "*/1 * * * * ntpdate ntp1.aliyun.com" > /var/spool/cron/root
174 hostname
175 }
176
177
178
179 echo "--------------------------------------------------------------------"
180 echo "本脚本可以根据需求选择要优化的选项-只是针对刚刚安装好的系统做优化,并且保证正常上网"
181 echo "--------------------------------------------------------------------"
182 echo "请选择你要使用的选项:"
183 echo "(0) 基本优化"
184 echo "(9) Exit"
185 echo "--------------------------------------------------------------------"
186 read -p "请输入选项编号>>>>:" input
187
188 case $input in
189 0)
190 echo "-----------执行基本优化---------------"
191 sleep 1
192 All;;
193 9)
194 echo "-----------退出脚本---------------"
195 exit;;
196 esac
脚本二:
#!/bin/bash
#Cenetos6/7初始化脚本
# get os version
RELEASEVER=$(rpm -q --qf "%{VERSION}" $(rpm -q --whatprovides redhat-release))
# configure yum source
cd /etc/yum.repos.d/
mkdir /etc/yum.repos.d/bak
mv /etc/yum.repos.d/*.repo /etc/yum.repos.d/bak
if [ $RELEASEVER == 6 ];then
curl http://mirrors.163.com/.help/CentOS6-Base-163.repo > qf.repo
fi
if [ $RELEASEVER == 7 ];then
curl http://mirrors.163.com/.help/CentOS7-Base-163.repo > qf.repo
fi
yum clean all
yum check-update
# install base rpm package
yum -y install epel-release
yum -y install nc vim iftop iotop dstat tcpdump
yum -y install ipmitool bind-libs bind-utils
yum -y install libselinux-python ntpdate
# update rpm package include kernel
yum -y update
rm -rf /etc/yum.repos.d/CentOS*
# update ulimit configure
if [ $RELEASEVER == 6 ];then
test -f /etc/security/limits.d/90-nproc.conf && rm -rf /etc/security/limits.d/90-nproc.conf && touch /etc/security/limits.d/90-nproc.conf
fi
if [ $RELEASEVER == 7 ];then
test -f /etc/security/limits.d/20-nproc.conf && rm -rf /etc/security/limits.d/20-nproc.conf && touch /etc/security/limits.d/20-nproc.conf
fi
> /etc/security/limits.conf
cat >> /etc/security/limits.conf <<EOF
* soft nproc 65535
* hard nproc 65535
* soft nofile 65535
* hard nofile 65535
EOF
# set timezone
test -f /etc/localtime && rm -rf /etc/localtime
ln -s /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
# set LANG
if [ $RELEASEVER == 6 ];then
sed -i 's@LANG=.*$@LANG="en_US.UTF-8"@g' /etc/sysconfig/i18n
fi
if [ $RELEASEVER == 7 ];then
sed -i 's@LANG=.*$@LANG="en_US.UTF-8"@g' /etc/locale.conf
fi
# update time
if [ $RELEASEVER == 6 ];then
/usr/sbin/ntpdate -b pool.ntp.org
grep -q ntpdate /var/spool/cron/root
if [ $? -ne 0 ]; then
echo '* * * * * /usr/sbin/ntpdate pool.ntp.org > /dev/null 2>&1' > /var/spool/cron/root;chmod 600 /var/spool/cron/root
fi
/etc/init.d/crond restart
fi
if [ $RELEASEVER == 7 ];then
yum -y install chrony
> /etc/chrony.conf
cat > /etc/chrony.conf << EOF
server pool.ntp.org iburst
stratumweight 0
driftfile /var/lib/chrony/drift
rtcsync
makestep 10 3
bindcmdaddress 127.0.0.1
bindcmdaddress ::1
keyfile /etc/chrony.keys
commandkey 1
generatecommandkey
noclientlog
logchange 0.5
logdir /var/log/chrony
EOF
systemctl restart chronyd
systemctl enable chronyd
fi
# clean iptables default rules
if [ $RELEASEVER == 6 ];then
/sbin/iptables -F
service iptables save
chkconfig iptables off
fi
if [ $RELEASEVER == 7 ];then
systemctl disable firewalld
fi
# disable unused service
chkconfig auditd off
# disable ipv6
cd /etc/modprobe.d/ && touch ipv6.conf
> /etc/modprobe.d/ipv6.conf
cat >> /etc/modprobe.d/ipv6.conf << EOF
alias net-pf-10 off
alias ipv6 off
EOF
# disable iptable nat moudule
cd /etc/modprobe.d/ && touch connectiontracking.conf
> /etc/modprobe.d/connectiontracking.conf
cat >> /etc/modprobe.d/connectiontracking.conf <<EOF
install nf_nat /bin/true
install xt_state /bin/true
install iptable_nat /bin/true
install nf_conntrack /bin/true
install nf_defrag_ipv4 /bin/true
install nf_conntrack_ipv4 /bin/true
install nf_conntrack_ipv6 /bin/true
EOF
# disable SELINUX
setenforce 0
sed -i 's/^SELINUX=.*$/SELINUX=disabled/' /etc/selinux/config
# update record command
sed -i 's/^HISTSIZE=.*$/HISTSIZE=100000/' /etc/profile
grep -q 'HISTTIMEFORMAT' /etc/profile
if [[ $? -eq 0 ]]; then
sed -i 's/^HISTTIMEFORMAT=.*$/HISTTIMEFORMAT="%F %T "/' /etc/profile
else
echo 'HISTTIMEFORMAT="%F %T "' >> /etc/profile
fi
# install dsnmasq and update configure //本地dns查询缓存
yum -y install dnsmasq
> /etc/dnsmasq.conf
cat >> /etc/dnsmasq.conf<< EOF
listen-address=127.0.0.1
no-dhcp-interface=lo
log-queries
log-facility=/var/log/dnsmasq.log
all-servers
no-negcache
cache-size=1024
dns-forward-max=512
EOF
if [ $RELEASEVER == 6 ];then
/etc/init.d/dnsmasq restart
fi
if [ $RELEASEVER == 7 ];then
systemctl restart dnsmasq
systemctl enable dnsmasq
fi
# update /etc/resolv.conf
> /etc/resolv.conf
cat >> /etc/resolv.conf<< EOF
options timeout:1
nameserver 127.0.0.1
nameserver 114.114.114.114
EOF
# update /etc/sysctl.conf
cat >> /etc/sysctl.conf<< EOF
net.ipv4.tcp_syncookies = 1
kernel.core_uses_pid=1
kernel.core_pattern=/tmp/core-%e-%p
fs.suid_dumpable=2
net.ipv4.tcp_tw_reuse=1
net.ipv4.tcp_tw_recycle=0
net.ipv4.tcp_timestamps=1
EOF
sysctl -p
#注:按标签查看rpm包信息
## rpm -q vsftpd
#vsftpd-3.0.2-21.el7.x86_64
##
## rpm -q --qf "%{NAME}" vsftpd
#vsftpd#
## rpm -q --qf "%{NAME}\n" vsftpd
#vsftpd
## rpm -q --qf "%{VERSION}\n" vsftpd
#3.0.2
## rpm -q --qf "%{RELEASE}\n" vsftpd
#21.el7
## rpm -q --qf "%{ARCH}\n" vsftpd
#x86_64