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Testing UDP port connectivity

Testing UDP port connectivity

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Answer: Using Ansible to stop service that might not exist

Answer: Using Ansible to stop service that might not exist

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cheat command

cheat command

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压测nginx出现no live upstreams while connecting to upstream的问题分析

压测nginx出现no live upstreams while connecting to upstream的问题分析

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yaml indentation

yaml indentation

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Local taskbar visible during remote desktop fullscreen

Local taskbar visible during remote desktop fullscreen

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Why does the dot command (source) not work on files without path in zsh?

Why does the dot command (source) not work on files without path in zsh?

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nginx upstream failover

nginx upstream failover

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nginx, consul, mysql high availability

nginx, consul, mysql high availability

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abrt-watch-log

abrt-watch-log

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get available memory in gb using single bash shell command

get available memory in gb using single bash shell command

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get the number of cpus

get the number of cpus

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How to match digits in sed?

How to match digits in sed?

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新创建的虚拟机网络异常

新创建的虚拟机网络异常

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use PowerShell to list listener

use PowerShell to list listener

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X Forward depend on xauth executable binary on the server side

X Forward depend on xauth executable binary on the server side

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Answer: Regex to match string containing two names in any order

Answer: Regex to match string containing two names in any order

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Answer: SQLPLUS error:ORA-12504: TNS:listener was not given the SERVICE_NAME in CONNECT_DATA

Answer: SQLPLUS error:ORA-12504: TNS:listener was not given the SERVICE_NAME in CONNECT_DATA

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反向代理替换response body中的字符串

反向代理替换response body中的字符串

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change case sensitive setting in less command

change case sensitive setting in less command

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ansible inventory plugin: host_list

ansible inventory plugin: host_list

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How to check MySQL Config files

How to check MySQL Config files

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server returned error on SASL authentication step: Authentication failed

server returned error on SASL authentication step: Authentication failed

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Nginx - rewrite or return for redirection?

Nginx - rewrite or return for redirection?

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The attempted operation is not supported for the type of object referenced

The attempted operation is not supported for the type of object referenced

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Windows behaves as if the left shift key is stuck

Windows behaves as if the left shift key is stuck

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Valid file extensions for ansible inventory

Valid file extensions for ansible inventory

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vsphere esxi 使用

vsphere esxi 使用

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Answer: Kubernetes Pod stuck in CrashLoopBackOff

Answer: Kubernetes Pod stuck in CrashLoopBackOff

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docker 重启失败

docker 重启失败

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/etc/security/limits.

/etc/security/limits.

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bash 函数 return 1 是表示执行失败

bash 函数 return 1 是表示执行失败

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quote in ssh bash -c

quote in ssh bash -c

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Why do the md5 hashes of two tarballs of the same file differ?

Why do the md5 hashes of two tarballs of the same file differ?

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kubectl -ojsonpath

kubectl -ojsonpath

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解决 Kubernetes 中 Kubelet 组件报 failed to get cgroup 错误

解决 Kubernetes 中 Kubelet 组件报 failed to get cgroup 错误

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Answer: how to run kubelet as docker container

Answer: how to run kubelet as docker container

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the associated storage asset still exists when the pv is deleted

the associated storage asset still exists when the pv is deleted

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Galera Cluster Recovery

Galera Cluster Recovery

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Answer: How to see docker image contents

Answer: How to see docker image contents

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windows hosts file do not support inline comments

windows hosts file do not support inline comments

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Answer: What is the difference between the random.choices() and random.sample() functions?

Answer: What is the difference between the random.choices() and random.sample() functions?

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Answer: Set specific DNS server using dns.resolver (pythondns)

Answer: Set specific DNS server using dns.resolver (pythondns)

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Answer: How to copy Docker images from one host to another without using a repository

Answer: How to copy Docker images from one host to another without using a repository

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I was misguided by the network policy of the office when I try to determine whether the target port of target server is open

I was misguided by the network policy of the office when I try to determine whether the target port of target server is open

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Answer: Grep in MySQL CLI interpretter

Answer: Grep in MySQL CLI interpretter

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add worker label to worker node in k8s

add worker label to worker node in k8s

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忘了添加允许外网访问的 firewall rule 导致的问题

忘了添加允许外网访问的 firewall rule 导致的问题

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beawre the place where you put ssh include directive after

beawre the place where you put ssh include directive after

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ansible lineinfile 中 regexp 如果匹配多行,只会修改其中一行

ansible lineinfile 中 regexp 如果匹配多行,只会修改其中一行

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ssh login to the wrong machine

ssh login to the wrong machine

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ansible create empty file if it does not exist

ansible create empty file if it does not exist

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auto start cron in wsl2

auto start cron in wsl2

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the value of ansible_hostname is not fixed after the fact gathering

the value of ansible_hostname is not fixed after the fact gathering

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ansible cannot connection after change ip of target

ansible cannot connection after change ip of target

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ansible only use one configuration file, not combine all the configuration files

ansible only use one configuration file, not combine all the configuration files

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ssh configuration in windows

ssh configuration in windows

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Answer: docker find container by pid of inside process

Answer: docker find container by pid of inside process

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rsync continue a broken scp command

rsync continue a broken scp command

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recover from a interrupted yum upgrade

recover from a interrupted yum upgrade

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