Centos7系统初始化

1.开始配置yum源(这里使用阿里云)
```
mv /etc/yum.repos.d/* /tmp
curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
curl -o /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo
yum makecache
```
2.下载常用必备软件
```
yum install -y libcurl openssl lrzsz httpd  gcc cpp binutils glibc-kernheaders  glibc-common  glibc-devel make gcc-c++ automake autoconf libtool make zlib-devel openssl-devel tree nmap sysstat dos2unix telnet bash-completion bash-completion-extras vim nc lsof  net-tools rsync ntpdate open-sshclients tree screen nload sysstat wget
```
3.关闭防火墙
```
systemctl  stop  firewalld
systemctl  disable  firewalld
```
4.优化SElinux
```
setenforce  0
sed -i  's#^SELINUX=.*#SELINUX=disabled#g'  /etc/sysconfig/selinux
```
5.关闭NetworkManager
```
systemctl  stop  NetworkManager
systemctl  disable  NetworkManager
```
6.同步阿里云系统时间
```
echo '#Timing synchronization time' >>/var/spool/cron/root
echo '*/5 * * * * /usr/sbin/ntpdate ntp1.aliyun.com &>/dev/null' >>/var/spool/cron/root
```
7.加大文件描述符
```
echo '*               -       nofile          65535 ' >>/etc/security/limits.conf
```
8.命令行优化
```
cat>>/etc/profile.d/color.sh<<-EOF
alias ll='ls -l --color=auto --time-style=long-iso'
PS1="\[\e[37;40m\][\[\e[32;1m\]\u\[\e[37;40m\]@\h \[\e[36;40m\]\w\[\e[0m\]]\[\e[32;1m\]\\# \[\e[0m\]"
export HISTTIMEFORMAT='%F-%T '
EOF
source /etc/profile
```
9.优化内核参数
```
[ -f /etc/sysctl.conf.bak ] || cp  /etc/sysctl.conf{,.bak}
cat >/etc/sysctl.conf<<-EOF
vm.swappiness = 0
net.ipv4.neigh.default.gc_stale_time=120

net.ipv4.conf.all.rp_filter=0
net.ipv4.conf.default.arp_announce = 2
net.ipv4.conf.lo.arp_announce=2
net.ipv4.conf.all.arp_announce=2
net.ipv4.tcp_syncookies = 1
kernel.sysrq=1

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
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 = 10000 65000
EOF
sysctl -p
```
10.设置主机名
```
hostname <主机名>                  #临时修改
hostnamectl set-hostname <主机名>  #永久修改
```

最后更新于 2023-02-06 10:01:17 并被添加「」标签，已有 2503 位童鞋阅读过。

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Centos7系统初始化

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