CentOS7使用

基本环境
SELINUX/iptables
systemctl

基本环境

下载CentOS-7-x86_64-Minimal-2009.iso最小化安装，缺少常用命令ifconfig、netstat，vi无代码高亮，使用yum安装：

# 系统更新检查
yum check-update
yum update

# 更新内核
yum update kernel

# 安装常用工具
yum install net-tools 
yum install vim-minimal vim-common vim-enhanced vim-filesystem

添加用户sudo权限

# 方式一：将用户添加到 wheel 用户组
usermod -aG wheel <username>

# 方式二：将用户添加到 sudoers 文件:
# /etc/sudoers
# /etc/sudoers.d/

SELINUX/iptables

CentOS默认启用了SELINUX:

CentOS7中iptables、firewalld：https://blog.csdn.net/weixin_30878501/article/details/98232144

sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config
setenforce 0
systemctl stop firewalld  && systemctl disable firewalld

sestatus

SELinux status:                 enabled
SELinuxfs mount:                /sys/fs/selinux
SELinux root directory:         /etc/selinux
Loaded policy name:             targeted
Current mode:                   enforcing
Mode from config file:          enforcing
Policy MLS status:              enabled
Policy deny_unknown status:     allowed
Max kernel policy version:      31

systemctl

# 配置服务

# https://www.freedesktop.org/software/systemd/man/systemd.exec.html
# [Unit]部分主要是对服务的说明，包括Description（描述服务）、After(描述服务启动顺序)
# [Service]服务启动、重启、停止命令配置，全部要使用绝对路径：
#   Type:forking,simple
#   PIDFile:PID文件
#   ExecStart:启动命令，ExecStop:停止命令，ExecReload:重启命令
#   PrivateTmp=True:给服务分配独立临时空间
#   StandardOutput:
#       null:关闭程序业务日志输出
#       StandardInput=null
#       StandardOutput=journal
#       StandardError=inherit
# Manual page systemd.exec
# 如果您的发行版较新systemd（systemd版本236或更高），则可以将StandardOutput或的值设置StandardError为file:YOUR_ABSPATH_FILENAME。
# 输出到file:/append:是相对较新的功能，因此不适用于较旧的发行版，如centos-7（或之前的任何centos）。
# [Install]描述服务安装相关设置

# /lib/systemd/system/prometheus.service
# /etc/systemd/system/multi-user.target.wants/prometheus.service
[Unit]
Description=Prometheus
Documentation=https://prometheus.io/
After=network.target

[Service]
Type=simple
User=prometheus
ExecStart=/data/prometheus/bin/prometheus --config.file=/data/prometheus/conf/prometheus.yml --storage.tsdb.path=/data/prometheus/data --storage.tsdb.retention=90d --log.level=debug --log.format=logfmt
#--web.external-url=http://prom.k8stech.net
Restart=on-failure
StandardOutput=/var/log/prometheus.log

[Install]
WantedBy=multi-user.target

systemctl enable prometheus.service
systemctl start prometheus.service
systemctl log prometheus.service
systemctl daemon-reload 
systemctl show prometheus.service

systemctl日志查看

# 显示所有的systemctl的日志，这里的日志是多个服务混合的
journalctl -f
journalctl -u prometheus.service

openresty

https://openresty.org/cn/installation.html

https://github.com/openresty/opm

wget https://openresty.org/package/centos/openresty.repo
sudo mv openresty.repo /etc/yum.repos.d/

# update the yum index:
sudo yum check-update

yum install openresty openresty-opm

opm search mysql

openresty/lua-resty-mysql                         Lua MySQL client driver for ngx_lua based on the cosocket API
openresty/lua-resty-websocket                     Lua WebSocket implementation for the ngx_lua module
openresty/lua-resty-redis                         Lua redis client driver for the ngx_lua based on the cosocket API
openresty/lua-resty-upload                        Streaming reader and parser for HTTP file uploading based on ngx_lua cosocket
openresty/lua-resty-dns                           Lua DNS resolver for the ngx_lua based on the cosocket API
openresty/lua-resty-memcached                     Lua memcached client driver for the ngx_lua based on the cosocket API