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Roy

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Testing UDP port connectivity
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Roy

Testing UDP port connectivity

#network
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Answer: Using Ansible to stop service that might not exist
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Roy

Answer: Using Ansible to stop service that might not exist

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1 min read
cheat command
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Roy

cheat command

#linux #command
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1 min read
压测nginx出现no live upstreams while connecting to upstream的问题分析
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Roy

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

#nginx
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1 min read
yaml indentation
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Roy

yaml indentation

#yaml
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1 min read
Local taskbar visible during remote desktop fullscreen
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Roy

Local taskbar visible during remote desktop fullscreen

#troubleshootin #windows
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1 min read
Why does the dot command (source) not work on files without path in zsh?
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Roy

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

#zsh
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1 min read
nginx upstream failover
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Roy

nginx upstream failover

#nginx
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1 min read
nginx, consul, mysql high availability
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Roy

nginx, consul, mysql high availability

#nginx #consul #mysql
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1 min read
abrt-watch-log
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Roy

abrt-watch-log

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1 min read
get available memory in gb using single bash shell command
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Roy

get available memory in gb using single bash shell command

#tips #command
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1 min read
get the number of cpus
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Roy

get the number of cpus

#tips #command #linux
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1 min read
How to match digits in sed?
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Roy

How to match digits in sed?

#sed #regex
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1 min read
新创建的虚拟机网络异常
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Roy

新创建的虚拟机网络异常

#troubleshooting
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1 min read
use PowerShell to list listener
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Roy

use PowerShell to list listener

#powershell
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1 min read
X Forward depend on xauth executable binary on the server side
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Roy

X Forward depend on xauth executable binary on the server side

#ssh #linux
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1 min read
Answer: Regex to match string containing two names in any order
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Roy

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

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

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

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1 min read
反向代理替换response body中的字符串
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反向代理替换response body中的字符串

#nginx
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1 min read
change case sensitive setting in less command
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change case sensitive setting in less command

#linux #cli
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1 min read
ansible inventory plugin: host_list
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ansible inventory plugin: host_list

#ansible
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1 min read
How to check MySQL Config files
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How to check MySQL Config files

#mysql
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1 min read
server returned error on SASL authentication step: Authentication failed
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server returned error on SASL authentication step: Authentication failed

#mongodb
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1 min read
Nginx - rewrite or return for redirection?
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Nginx - rewrite or return for redirection?

#nginx
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1 min read
The attempted operation is not supported for the type of object referenced
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The attempted operation is not supported for the type of object referenced

#wsl
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1 min read
Windows behaves as if the left shift key is stuck
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Windows behaves as if the left shift key is stuck

#windows #troubleshooting
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1 min read
Valid file extensions for ansible inventory
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Valid file extensions for ansible inventory

#ansible
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1 min read
vsphere esxi 使用
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vsphere esxi 使用

#vmware
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1 min read
Answer: Kubernetes Pod stuck in CrashLoopBackOff
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Answer: Kubernetes Pod stuck in CrashLoopBackOff

#kubernetes
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1 min read
docker 重启失败
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docker 重启失败

#docker
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1 min read
/etc/security/limits.
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/etc/security/limits.

#linux
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1 min read
bash 函数 return 1 是表示执行失败
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bash 函数 return 1 是表示执行失败

#shell
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1 min read
quote in ssh bash -c
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quote in ssh bash -c

#linux #ssh #troubleshoooting
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1 min read
Why do the md5 hashes of two tarballs of the same file differ?
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Why do the md5 hashes of two tarballs of the same file differ?

#linux
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1 min read
kubectl -ojsonpath
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kubectl -ojsonpath

#k8s
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1 min read
解决 Kubernetes 中 Kubelet 组件报 failed to get cgroup 错误
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解决 Kubernetes 中 Kubelet 组件报 failed to get cgroup 错误

#k8s
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1 min read
Answer: how to run kubelet as docker container
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Answer: how to run kubelet as docker container

#k8s #container
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1 min read
the associated storage asset still exists when the pv is deleted
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the associated storage asset still exists when the pv is deleted

#k8s
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1 min read
Galera Cluster Recovery
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Galera Cluster Recovery

#mariadb #galera
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1 min read
Answer: How to see docker image contents
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Answer: How to see docker image contents

#docker
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1 min read
windows hosts file do not support inline comments
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windows hosts file do not support inline comments

#windows #troubleshooting
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1 min read
Answer: What is the difference between the random.choices() and random.sample() functions?
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Answer: What is the difference between the random.choices() and random.sample() functions?

#python
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1 min read
Answer: Set specific DNS server using dns.resolver (pythondns)
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Answer: Set specific DNS server using dns.resolver (pythondns)

#python #dns
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1 min read
Answer: How to copy Docker images from one host to another without using a repository
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Answer: How to copy Docker images from one host to another without using a repository

#docker
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1 min read
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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I was misguided by the network policy of the office when I try to determine whether the target port of target server is open

#troubleshooting
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1 min read
Answer: Grep in MySQL CLI interpretter
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Answer: Grep in MySQL CLI interpretter

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1 min read
add worker label to worker node in k8s
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add worker label to worker node in k8s

#k8s
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1 min read
忘了添加允许外网访问的 firewall rule 导致的问题
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忘了添加允许外网访问的 firewall rule 导致的问题

#troubleshoooting
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1 min read
beawre the place where you put ssh include directive after
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beawre the place where you put ssh include directive after

#ssh #troubleshooting
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1 min read
ansible lineinfile 中 regexp 如果匹配多行，只会修改其中一行
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ansible lineinfile 中 regexp 如果匹配多行，只会修改其中一行

#ansible
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1 min read
ssh login to the wrong machine
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ssh login to the wrong machine

#ssh #troubleshooting
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1 min read
ansible create empty file if it does not exist
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ansible create empty file if it does not exist

#ansible
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1 min read
auto start cron in wsl2
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auto start cron in wsl2

#wsl2
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1 min read
the value of ansible_hostname is not fixed after the fact gathering
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the value of ansible_hostname is not fixed after the fact gathering

#ansible
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1 min read
ansible cannot connection after change ip of target
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ansible cannot connection after change ip of target

#ansible
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1 min read
ansible only use one configuration file, not combine all the configuration files
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ansible only use one configuration file, not combine all the configuration files

#ansible
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1 min read
ssh configuration in windows
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ssh configuration in windows

#ssh #windows
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1 min read
Answer: docker find container by pid of inside process
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Answer: docker find container by pid of inside process

#docker
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1 min read
rsync continue a broken scp command
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rsync continue a broken scp command

#linux #command #rsync
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1 min read
recover from a interrupted yum upgrade
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recover from a interrupted yum upgrade

#ops #linux #yum #redhat
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1 min read
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