Setting Server

Setting Server
sudo apt-get update (first Time)
1. create user
 useradd -m -d /home/new_user -s /bin/bash -g staff new_user
 passwd new_user
 sudo usermod -aG sudo new_user
1.1 Create User
 - create user (if needed)

 $ sudo adduser newuser
 note :
 - follow the instructions
 - one of the instructions may ask you to create password

 - add user as sudoers
 $ sudo usermod -aG sudo newuser
 then try to access newuser :
 $ su - newuser

2. setting SSH
 https://help.github.com/articles/generating-ssh-keys -> in github
 https://support.atlassian.com/bitbucket-cloud/docs/set-up-an-ssh-key/ -> in bitbucket
3. install Git
 apt-get install git
 if install git error (E: Unable to locate package git)
  sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys E1DD270288B4E6030699E45FA1715D88E1DF1F24
  sudo su -c "echo 'deb http://ppa.launchpad.net/git-core/ppa/ubuntu trusty main' > /etc/apt/sources.list.d/git.list"
  sudo apt-get update 
  sudo apt-get install git
4. install rbenv
 https://www.digitalocean.com/community/tutorials/how-to-install-ruby-on-rails-with-rbenv-on-ubuntu-18-04
 3. install ruby
 sudo usermod -a -G staff <some_user>
 sudo apt-get install autoconf bison build-essential libssl-dev libyaml-dev libreadline6-dev zlib1g-dev libncurses5-dev libffi-dev   libgdbm3 libgdbm-dev
 git clone https://github.com/sstephenson/ruby-build.git ~/.rbenv/plugins/ruby-build 
 if build fail because fiddle
    sudo apt-get install libffi-dev
 if ssh: Could not resolve hostname github.com: Name or service not known
  sudo vim /etc/resolv.conf
  write : nameserver 8.8.8.8
          nameserver 4.4.4.4
 rbenv install -l
 rbenv install 2.1.2
4. install service
 apt-get install nginx
 https://www.digitalocean.com/community/tutorials/how-to-install-mysql-on-ubuntu-18-04 -> install mysql
 echo "deb http://apt.postgresql.org/pub/repos/apt/ precise-pgdg main" > /etc/apt/sources.list.d/pgdg.list
 wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | sudo apt-key add -
 sudo apt-get update
 sudo apt-get install postgresql-9.3 postgresql-contrib-9.3
 if No PostgreSQL clusters exist; see "man pg_createcluster"
  export LC_ALL="en_US.UTF-8"
  sudo dpkg-reconfigure locales
  pg_createcluster 9.3 main --start
5. setting database
 - go to psql (postgres)
 - create user : CREATE USER username WITH PASSWORD 'password';
 - create database: CREATE DATABASE name;
 - change owner: ALTER DATABASE demo OWNER TO username;
6. if rmagick error while bundle install
  sudo apt-get install imagemagick libmagickwand-dev
7. if mysql2 error while bundle install
  sudo apt-get install mysql-server mysql-client libmysqlclient-dev
8. postgresql can access by remote
  - open postgresql.conf
  - change listen_address to listen_addresses = '*'
  - open pg_hba.conf and add following entry at the very end.
  - add code like this "host    replication     rep     103.17.55.76/24         md5"
9. install sublime
 - sudo add-apt-repository ppa:webupd8team/sublime-text-3
 - sudo apt-get update
 - sudo apt-get install sublime-text-installer
10. install redis
 https://www.digitalocean.com/community/tutorials/how-to-install-and-configure-redis-on-ubuntu-16-04