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  • brew 切换 python 版本

    切换 python 至 3.6.5

    brew list python --versions
brew switch python 3.6.5

    升级 python3

    brew install python3

    link 切换

    ➜  ✗ brew link python
Linking /usr/local/Cellar/python/3.7.7... 
Error: Could not symlink Frameworks/Python.framework/Headers
Target /usr/local/Frameworks/Python.framework/Headers
is a symlink belonging to python@2. You can unlink it:
  brew unlink python@2
解除 python@2 link
Unlinking /usr/local/Cellar/python@2/2.7.17... 34 symlinks removed


To force the link and overwrite all conflicting files:
  brew link --overwrite python

To list all files that would be deleted:
  brew link --overwrite --dry-run python
➜  ✗ brew link python --overwrite python
Linking /usr/local/Cellar/python/3.7.7... 28 symlinks created

  • CentOS 7 systemd 禁用 gnome 启动

    平时自己家里的 CentOS 7 不需要图形界面，所以禁用

    查看当前启动模式，发现时界面模式

    [root@192 ~]# systemctl get-default 
graphical.target

    将界面模式改为多用户无界面模式，重启生效

    [root@192 ~]# systemctl set-default multi-user.target
Removed symlink /etc/systemd/system/default.target.
Created symlink from /etc/systemd/system/default.target to /usr/lib/systemd/system/multi-user.target.
[root@192 ~]# systemctl reboot

  • clean_merged 清理已经合并的 git 分支

    alias clean_merged='git checkout master && git branch --merged | grep -v master | xargs git branch -D'

  • git 本地新建分支在远端自动创建并设置 upstream

    .git/config 添加

    [push]
    default = current

    push 的时候加上 -u

    git push -u

  • docker-compose

    sudo pip install -U docker-compose

    编写

    version: '3.2'
services:
  db:
    image: mysql:5.7.21
    container_name: mysql
    hostname: mysql-test-1
    restart: always
    ports:
      - 3306:3306
    environment:
      - MYSQL_ALLOW_EMPTY_PASSWORD=YES
    volumes:
      - ./tmp:/var/lib/mysql

  broker:
    image: redis:3.0-alpine
    command: redis-server 
    container_name: broker
    hostname: broker-test-1
    restart: always
    ports:
      - 6379:6379
    volumes:
      - ./tmp:/var/lib/redis

    拉起 docker

    docker-compose up -d

  • 关闭 swap 操作

    检查:

    free -m # 应该 Swap 显示全是 0

    备份 /etc/fstab

    cp /etc/fstab /tmp/fstab.`date +%F`

    删除 /etc/fstab 中 swap 挂载项

    vim /etc/fstab

    关闭所有 swap

    swapoff -a

    观察进程使用 swap 和 swapoff -a 之后回收情况，对于不能回收 swap 的进程需要安排时间重启

    
free -m
for file in /proc/*/status ; do cat $file | awk '/Name|^Pid|VmSwap/{printf $2 " " $3 $4}END{ print ""}' | grep kB | grep -v '0 kB' ; done | sort -k 3 -n