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jenkins setup

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YIk Teng Hie 5 years ago
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# Useful shell command # Useful shell command
* commands * commands
```shell ```shell
// add a user to root group // add a user to root group
$ visudo $ visudo
# User privilege specification # User privilege specification
root ALL=(ALL:ALL) ALL root ALL=(ALL:ALL) ALL
newuser ALL=(ALL:ALL)ALL newuser ALL=(ALL:ALL)ALL
hold `ctrl` and press `x` to save and exit hold `ctrl` and press `x` to save and exit
// list all running process // list all running process
$ ps aux $ ps aux
``` ```
* run as root * run as root
```shell ```shell
user@host$ sudo su - user@host$ sudo su -
// prompt will show root login // prompt will show root login
root@host$ root@host$
``` ```
* add a user to a group * add a user to a group
```shell ```shell
// create docker group // create docker group
$ sudo groupadd docker $ sudo groupadd docker
// add current user to group // add current user to group
$ sudo usermod -aG docker ${USER} $ sudo usermod -aG docker ${USER}
// restart to take effect // restart to take effect
``` ```
* change file permission * change file permission
```shell ```shell
// excecute, read, write // excecute, read, write
$ chmod 777 filename $ chmod 777 filename
// made executable // made executable
$ chmod +x envtest.sh $ chmod +x envtest.sh
``` ```
## node version manager [nvm](https://github.com/nvm-sh/nvm) ## node version manager [nvm](https://github.com/nvm-sh/nvm)
* For proper installing, using version manager for nodejs to install nodejs/npm * For proper installing, using version manager for nodejs to install nodejs/npm
* use nvm * use nvm
* to avoid npm version conflict installation with nodejs * to avoid npm version conflict installation with nodejs
* to install / switch to lower / newer version on any version ubuntu * to install / switch to lower / newer version on any version ubuntu
* ubuntu 20.10 default support node 12 * ubuntu 20.10 default support node 12
* ubuntu 19.10 default support node 10 * ubuntu 19.10 default support node 10
```shell ```shell
// installation // installation
$ curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.38.0/install.sh | bash $ curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.38.0/install.sh | bash
$ wget -qO- https://raw.githubusercontent.com/nvm-sh/nvm/v0.38.0/install.sh | bash $ wget -qO- https://raw.githubusercontent.com/nvm-sh/nvm/v0.38.0/install.sh | bash
$ export NVM_DIR="$([ -z "${XDG_CONFIG_HOME-}" ] && printf %s "${HOME}/.nvm" || printf %s "${XDG_CONFIG_HOME}/nvm")" $ export NVM_DIR="$([ -z "${XDG_CONFIG_HOME-}" ] && printf %s "${HOME}/.nvm" || printf %s "${XDG_CONFIG_HOME}/nvm")"
# This loads nvm # This loads nvm
$ [ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh" $ [ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh"
// to install node version 10.10.0 // to install node version 10.10.0
$ nvm install 10.10.0 $ nvm install 10.10.0
// remove node to solve conflicting version // remove node to solve conflicting version
$ sudo apt-get remove nodejs $ sudo apt-get remove nodejs
$ sudo apt autoremove $ sudo apt autoremove
``` ```
* ssh id * ssh id
```shell ```shell
$ ssh-keygen $ ssh-keygen
// copy ssh public key to host .ssh/authorized_keys to allow passwordless ssh // copy ssh public key to host .ssh/authorized_keys to allow passwordless ssh
$ ssh-copy-id -i abc@host $ ssh-copy-id -i abc@host
// alternatively, copy local .ssh/rsa_id.pub content into target server authorized_keys // alternatively, copy local .ssh/rsa_id.pub content into target server authorized_keys
``` ```
* environments * environments
```shell ```shell
// add global variable // add global variable
// method1 : cli // method1 : cli
$ export VARNAME="value" $ export VARNAME="value"
$ set VARNAME="Value" $ set VARNAME="Value"
// add local variable // add local variable
$ VARNAME=Value $ VARNAME=Value
// remove // remove
$ unset VARNAME $ unset VARNAME
$ VARNAME='' $ VARNAME=''
// user wide env // user wide env
$ sudo vi ~/.bashrc $ sudo vi ~/.bashrc
.. ..
export NAME=Value export NAME=Value
... ...
// system wide ENV file // system wide ENV file
$ nano /etc/environment $ nano /etc/environment
// reload a file // reload a file
$ source /etc/bash.bashrc $ source /etc/bash.bashrc
// show a variable // show a variable
$ echo $VARNAME $ echo $VARNAME
// show all variables // show all variables
$ printenv | sort | less $ printenv | sort | less
$ env | grep GNOME $ env | grep GNOME
$ myvar=(first second third) $ myvar=(first second third)
$ echo ${myvar[2]} $ echo ${myvar[2]}
third third
$ echo ${myvar[*]} $ echo ${myvar[*]}
first second third first second third
``` ```
* startup file execution order from login shell * startup file execution order from login shell
* `/etc/profile` * `/etc/profile`
* `$HOME/.bash_login` * `$HOME/.bash_login`
* `$HOME/.bash_profile` * `$HOME/.bash_profile`
* `$HOME/.profile` * `$HOME/.profile`
* startup file from interactive shell * startup file from interactive shell
* `.bashrc` instead of `/etc/profile` * `.bashrc` instead of `/etc/profile`
## Rebuild HOME
* Repair fstab
```sh
// find the new UUID
$ blkid
// update the UUID
$ nano /etc/fstab
```
* login as su
```sh
$ sudo su
//
$ mkhomedir_helper <username>
```

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