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Roy

404 bio not found

Joined on May 16, 2020

Dec 8 '20

relational expression and /regular expression/ in awk

1 min read

show http proxy used by ansible

you cannot use - name: show http_proxy ...

Sep 17 '20

Dec 8 '20

cmd1 && cmd2 || cmd3 is not the same as if cmd1; then cmd2; else cmd3;fi

#bash

1 min read

Nov 17 '20

difference between rm and unlink

#command

1 min read

Nov 12 '20

Answer: Ansible fileglob: unable to find … in expected paths

#ansible

1 min read

Oct 10 '20

Prevent harmful Linux updates with versionlock

1 min read

Sep 29 '20

Answer: Run only one task and handler from ansible playbook

#ansible

1 min read

Sep 26 '20

Ctrl-v I # cannot comment out multiple lines

#vim #troubleshooting

1 min read

Sep 26 '20

failed to switch container runtime to containerd

#k8s

1 min read

Sep 25 '20

apt cacher for faster downloading rpm/deb pkgs

#debian

1 min read

Sep 25 '20

a wrong indent in yaml make comment invalid

#ansible

1 min read

Sep 24 '20

nodename and hostname in ansible

#ansible

1 min read

Sep 24 '20

small error related to quote and indent in ansible playbook loop

#ansible

1 min read

Sep 23 '20

yum --disableexclude

1 min read

Sep 23 '20

ssh can not resolve hostname in included config file

#ssh

1 min read

Sep 23 '20

fix problems after rename vagrant project

#vagrant

1 min read

Sep 23 '20

open search result in new tab

1 min read

Sep 21 '20

vagrant cannot create a custom named network for virtualbox

#vagrant #virtualbox

1 min read

Sep 21 '20

docker: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers).

#docker #k8s

1 min read

Sep 21 '20

Ansible: Further plays are not executing if task in one play failed when multiple plays in a playbook

#ansible

1 min read

Sep 21 '20

vagrant will not run an ansible play if the vm do not match the hosts line in the play

#vagrant #ansible

1 min read

Sep 21 '20

specify image-repository fo kubeadm

1 min read

Sep 21 '20

Client.Timeout exceeded while awaiting headers in docker pull

#docker #k8s

1 min read

Sep 18 '20

variable defined in environment not show in ansible_env

1 min read

Sep 17 '20

mistakenly set the wrong environment variable

#troubleshooting #ansible

1 min read

Sep 10 '20

ansible create skipped

#ansible

1 min read

Jun 19 '20

Answer: set expandtab in .vimrc not taking effect

#vim

1 min read

Jun 18 '20

A YAML Primer

#yaml

1 min read

Jun 18 '20

yaml quote escape

#yaml

1 min read

Jun 17 '20

ansible local facts

#ansible

1 min read

Jun 17 '20

ansible Lazy Evaluation

#ansible

1 min read

Jun 17 '20

jinja2 filter: trim

#ansible #jinja

1 min read

Jun 17 '20

ansible registered variable

#ansible

1 min read

Jun 17 '20

using python method in ansible Jinja2 context

#ansible

1 min read

Jun 17 '20

ansible relative path search order

#ansible

1 min read

Jun 15 '20

ansible include directive

#ansible

1 min read

Jun 15 '20

you should only put variable part in curly braces

#ansible

1 min read

Jun 15 '20

ansible role name should not contain hyphen

#ansible

1 min read

Jun 15 '20

show http proxy used by ansible

#ansible

1 min read

Jun 15 '20

killing a process group

#linux #tips

1 min read

Jun 4 '20

Answer: Ansible with_subelements

#ansible

1 min read

Jun 4 '20

create a role directroy structure in one line

#ansible

1 min read

Jun 4 '20

cannot put comments on the same line with instruction in ansible.cfg

#ansible

1 min read

Jun 4 '20

ansible gathering fact at every play

#ansible

1 min read

May 19 '20

idea complains ".class expected" when I use double.parseDouble

#java

1 min read

May 19 '20

Answer: IntelliJ cannot find any declarations

#java

1 min read

May 16 '20

Answer: How do I compare strings in Java?

#java

1 min read

May 16 '20

camel case

#java

1 min read

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