linux系统调优

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摘要

               6.4 启动服务   6.5 查看服务状态


1.禁用swap分区

swapoff -a && sysctl -w vm.swappiness=0  sed -ri '/^[^#]*swap/s@^@#@' /etc/fstab  grep swap /etc/fstab 

  

2. 禁用防火墙和selinux

2.1禁用防火墙,网络管理,邮箱

1 systemctl disable  --now firewalld NetworkManager postfix

 

2.2 禁用selinux

2.2.1 命令行直接修改

修改: setenforce 0  查看: getenforce 

  

2.2.2 基于配置文件进行修改

sed -i 's/^SELINUX=enforcing$/SELINUX=disabled/' /etc/selinux/config  grep ^SELINUX= /etc/selinux/config

 

3. 配置sshd优化

sed -ri  's@^#UseDNS yes@UseDNS no@g' /etc/ssh/sshd_config  sed -ri 's#^GSSAPIAuthentication yes#GSSAPIAuthentication no#g' /etc/ssh/sshd_config  grep ^UseDNS /etc/ssh/sshd_config  grep ^GSSAPIAuthentication  /etc/ssh/sshd_config

 

4. 修改文件打开数量的限制(退出当前会话立即生效)

基于配置文件修改 /etc/security/limits.d/file.conf  *       soft    nofile     65535  *       hard    nofile    131070   生效及查看 退出远程连接重新登录即可  ulimit -Sn  ulimit -Hn 

  

 

5.修改终端颜色

cat <<EOF >>  ~/.bashrc  PS1='[[e[34;1m]u@[e[0m][e[32;1m]H[e[0m][e[31;1m] W[e[0m]]# '  EOF  source ~/.bashrc 

  

 

6.基于chronyd守护进程实现集群时间同步:

6.1 手动同步时区和时间

cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime

6.2 安装服务chrony

yum -y install ntpdate chrony 

 

6.3 修改配置文件

vim /etc/chrony.conf  ...  server ntp.aliyun.com iburst  server ntp1.aliyun.com iburst  server ntp2.aliyun.com iburst  server ntp3.aliyun.com iburst  server ntp4.aliyun.com iburst  server ntp5.aliyun.com iburst 

  

 6.4启动服务

systemctl enable --now chronyd   

  

6.5 查看服务状态

systemctl status chronyd  chronyc activity -v

 

7. 配置yum

7.1配置阿里源

curl -s -o /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo  curl  -s -o /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo

注:也可以配置清华源:https://mirrors-i.tuna.tsinghua.edu.cn/

 

7.2 安装常用软件

yum -y install expect wget jq psmisc vim net-tools telnet yum-utils device-mapper-persistent-data lvm2 git ntpdate chrony bind-utils rsync unzip git

 

8.linux系统内核参数调优

8.1 调优参数文件:

vim /etc/sysctl.d/kernel.conf  net.ipv4.ip_forward = 1  net.bridge.bridge-nf-call-iptables = 1  net.bridge.bridge-nf-call-ip6tables = 1  fs.may_detach_mounts = 1  vm.overcommit_memory=1  vm.panic_on_oom=0  fs.inotify.max_user_watches=89100  fs.file-max=52706963  fs.nr_open=52706963  net.netfilter.nf_conntrack_max=2310720  net.ipv4.tcp_keepalive_time = 600  net.ipv4.tcp_keepalive_probes = 3  net.ipv4.tcp_keepalive_intvl =15  net.ipv4.tcp_max_tw_buckets = 36000  net.ipv4.tcp_tw_reuse = 1  net.ipv4.tcp_max_orphans = 327680  net.ipv4.tcp_orphan_retries = 3  net.ipv4.tcp_syncookies = 1  net.ipv4.tcp_max_syn_backlog = 16384  net.ipv4.ip_conntrack_max = 65536  net.ipv4.tcp_max_syn_backlog = 16384  net.ipv4.tcp_timestamps = 0  net.core.somaxconn = 16384 

  

8.2 参数生效

sysctl --system