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Roy

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relational expression and /regular expression/ in awk

relational expression and /regular expression/ in awk

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

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

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difference between rm and unlink

difference between rm and unlink

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

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

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Prevent harmful Linux updates with versionlock

Prevent harmful Linux updates with versionlock

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Answer: Run only one task and handler from ansible playbook

Answer: Run only one task and handler from ansible playbook

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Ctrl-v I # cannot comment out multiple lines

Ctrl-v I # cannot comment out multiple lines

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failed to switch container runtime to containerd

failed to switch container runtime to containerd

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apt cacher for faster downloading rpm/deb pkgs

apt cacher for faster downloading rpm/deb pkgs

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a wrong indent in yaml make comment invalid

a wrong indent in yaml make comment invalid

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nodename and hostname in ansible

nodename and hostname in ansible

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small error related to quote and indent in ansible playbook loop

small error related to quote and indent in ansible playbook loop

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yum --disableexclude

yum --disableexclude

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ssh can not resolve hostname in included config file

ssh can not resolve hostname in included config file

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fix problems after rename vagrant project

fix problems after rename vagrant project

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open search result in new tab

open search result in new tab

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vagrant cannot create a custom named network for virtualbox

vagrant cannot create a custom named network for virtualbox

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

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

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

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

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

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

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specify image-repository fo kubeadm

specify image-repository fo kubeadm

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Client.Timeout exceeded while awaiting headers in docker pull

Client.Timeout exceeded while awaiting headers in docker pull

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variable defined in environment not show in ansible_env

variable defined in environment not show in ansible_env

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mistakenly set the wrong environment variable

mistakenly set the wrong environment variable

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ansible create skipped

ansible create skipped

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Answer: set expandtab in .vimrc not taking effect

Answer: set expandtab in .vimrc not taking effect

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A YAML Primer

A YAML Primer

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yaml quote escape

yaml quote escape

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ansible local facts

ansible local facts

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ansible Lazy Evaluation

ansible Lazy Evaluation

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jinja2 filter: trim

jinja2 filter: trim

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ansible registered variable

ansible registered variable

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using python method in ansible Jinja2 context

using python method in ansible Jinja2 context

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ansible relative path search order

ansible relative path search order

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ansible include directive

ansible include directive

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you should only put variable part in curly braces

you should only put variable part in curly braces

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ansible role name should not contain hyphen

ansible role name should not contain hyphen

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show http proxy used by ansible

show http proxy used by ansible

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killing a process group

killing a process group

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Answer: Ansible with_subelements

Answer: Ansible with_subelements

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create a role directroy structure in one line

create a role directroy structure in one line

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

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

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ansible gathering fact at every play

ansible gathering fact at every play

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

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

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Answer: IntelliJ cannot find any declarations

Answer: IntelliJ cannot find any declarations

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Answer: How do I compare strings in Java?

Answer: How do I compare strings in Java?

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camel case

camel case

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