NGINX on CentOS 7: Install a SSL Certificate(from Godaddy )
https://www.godaddy.com/help/nginx-on-centos-7-install-a-certificate-27192
Read Moreremove pCloud Drive on Ubuntu/Debian
Remove pCloud Drive on Ubuntu/Debian system.
1, remove autostart from Tweaks Tool
2, run command
killall pcloud
\rm -rf ~/.pcloud
\rm -rf ~/.local/share/applications/appimagekit-pcloud.desktop
\rm -rf /tmp/.mount_pcloud*
\rm -rf /tmp/pcloud_unix_soc.sock
3, reboot.
Read Moreiptables delete some rules form a chain
以下两条命令均可用
iptables -t nat -L PREROUTING --line-numbers | grep RULE_NAME | cut -d" " -f 1 | xargs iptables -t nat -D PREROUTING
for i in $(iptables -t nat -nvL PREROUTING --line-numbers | grep RULE_NAME | grep ^[0-9] | awk '{ print $1 }' | tac); do iptables -t nat -D PREROUTING $i; done
How to run a crontab job every X seconds
如果你有一个job, 需要每隔5秒运行一次.
以下写法是错误的
* * * * * sleep 5; /bin/cmd
如果使用这种写法, 会导致在每分钟的第0秒开始, sleep 5秒以后, 再运行/bin/cmd, 然尔运行完就结束了, 不会每隔5秒运行一次.
正确写法1
* * * * * for i in {1..12}; do /bin/cmd; sleep 5; done
正确写法2
* * * * * REMAIN=60 INC=5 ; while ; do /bin/cmd; sleep $INC; REMAIN=$(($REMAIN - $INC)); done
正确写法3
* * * * * /bin/cmd
* * * * * sleep 5; /bin/cmd
* * * * * sleep 10; /bin/cmd
* * * * * sleep 15; /bin/cmd
......
* * * * * sleep 55; /bin/cmd
可以使用systemctl status cron.service -l命令看看cron服务的状态以及最新日志.
参考: How to run a cronjob every X seconds in cron
Read MoreUbuntu change password in one command line
echo user:pass | /usr/sbin/chpasswd
according to https://serverfault.com/questions/336298/can-i-change-a-user-password-in-linux-from-the-command-line-with-no-interactivit
Read Moredocker基础知识(一)
安装docker
# 适用ubuntu 16.04
$ sudo apt install docker docker.io
# 适用CentOS 7 (这部分文档来自Docker官方https://docs.docker.com/install/linux/docker-ce/centos/)
$ yum install -y yum-utils device-mapper-persistent-data lvm2 # 安装依赖
$ yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
$ yum install docker-ce docker-ce-cli containerd.io
$ systemctl start docker
一,images管理
搜索kms相关的image
$ sudo docker search kms
NAME DESCRIPTION STARS OFFICIAL AUTOMATED
luodaoyi/kms-server kms server 21 [OK]
lunker/kms ubuntu image repositoiry for kms 1
leon0516/py-kms this is beta version!!! 1 [OK]
captbrick/py-kms Py-KMS 1 [OK]
gkuzet/kms KMS Server written in C 1
openvidu/openvidu-server-kms OpenVidu platform service. It includes Ope... 1
比如第1个luodaoyi/kms-server,也可以用https://hub.docker.com/r/luodaoyi/kms-server/的方式查看相关信息.
下载想要的image(不必需)
$ sudo docker pull luodaoyi/kms-server
查看本地的images
$ sudo docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
luodaoyi/kms-server latest 4f86d964ac52 4 months ago 4.09 MB
$ sudo docker image ls
REPOSITORY TAG IMAGE ID CREATED SIZE
luodaoyi/kms-server latest 4f86d964ac52 4 months ago 4.09 MB
Linux get DevName of a directory
Linux系统下, 获得某一个子目录(例如/data/home/release )对应的DevName(如sdb等). 现在的情况是
有些机器是这样的
Filesystem Size Used Avail Use% Mounted on
......
/dev/sda5 1.6T 343G 1.2T 23% /data
而有些机器是这样的
Filesystem Size Used Avail Use% Mounted on
......
/dev/sda5 1.6T 343G 1.2T 23% /data
/dev/sdb 488M 56M 408M 12% /data/home/release
解决办法
part=`df -P /data/home/release | awk 'END{print $1}'` #得到一个诸如/dev/sda3的字符串
devname=${part:5:3} #切割上面的字符串,从第5位开始,取3位
echo $devname