Installing Node and npm::
Download nodejs installation file from : https://nodejs.org/en/download/
untar it to /opt/ , create the folder if it doesn’t exists ( sudo mkdir /opt)
tar -xvJf node-v10.16.0-linux-x64 -C /opt
x– un-compress, v-verbros, J– indicating target is xz, f– file path : f should be given before providing file name.
now create a symbolic link in /bin:
sudo ln -s -f /opt/node-v10.16.0-linux-x64/bin/node /bin/node sudo ln -s -f /opt/node-v10.16.0-linux-x64/bin/npm /bin/npm
Installing OpenJDK:
Download JDK tar from : https://jdk.java.net/java-se-ri/11
tar -xvzf openjdk-11+28_linux-x64_bin.tar.gz -C /opt/
now create a symbolic link:
sudo ln -s -f /opt/java-11/bin/java /bin/java
Git:………………….
sudo yum install git
unzip:…………………..
sudo yum install unzip
Note for Jenkins:
Please restart Jenkins for the installations to get reflected, close the shell and start again the service.
Installing Python2:………………….
Python2.7.5 is installed by default in CentOS 7, to verify use the below command
python --version
Install PIP for :
Goto : https://pip.pypa.io/en/stable/installing/ and follow the instructions ( You don’t have to , i have summarized the steps below)
Note: Always follow official documents like the one i gave above than following blogs.
Download pip installation script :
curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py
Run the get-pip.py script to install pip:
python get-pip.py
Done, now check the installation:
pip --version
Installing python3:…………………..
Download:
Download python source code from : https://www.python.org/downloads/release/python-374/
Note: you can download zip or xz format
Extract:
If using tar.xz , use -C to specify a different directory than current as destination folder
tar -xvJf Python-3.7.4.tar.xz
if you are using zip
unzip <file_name>
Install development Tools:
We need tools that could download dependency compile the source code etc. ‘Development tools’ gropu in yum has all the tools we need to compile and build the python tool from source code.
Lets install that..
sudo yum groupinstall -y "Development Tools"
install:
Goto extracted directory:
cd Python-3.7.4
Execute below commands:
Make the files executable
sudo chmod 777 *
Install zlib-devel, as cpython uses zlib compression and decompression:
sudo yum install zlib-devel
Install libffi-devel as cpython use libffi:
sudo yum install libffi-devel
Install openssl-devel ,as pip needs ssl module for downloading packages:
sudo yum install openssl-devel
Note: if you want to know more about any package , use the command ‘yum info <pkg_name>‘ Eg:
yum info libffi-devel
run the configure file
sudo ./configure
Make is an build utility that helps in building tools from source code, make command will compile all codes and download all required files
sudo make
Make altinstall, will install the tool to
sudo make altinstall
Note: python3 will be installed to /usr/local/bin/
Check python version:
python3.7 --version
To use pip:
pip3.7 --version
See symbolic path (Or real path if sym path is not set):
which python3.7
To see actual installation :
Goto folder in the above command result. See python3 ( it will be in light blue color , indicating that its a symboliclink. Means a link to actual file)
To see actual file, give below command. It gives details of actual file.
readlink -f python3
Note: if you want the commands to be available only for the current user , then create the symbolic link in /usr/bin instead of /usr/local/bin
Creating user :
sudo adduser linuxize
Create password:
sudo passwd linuxize
Add to sudoers file:
sudo usermod -aG wheel linuxize
Removing a symbolic link:
sudo rm <symbolic_link_path> or sudo unlink <symboliclink_path>
sudo rm /usr/bin/java sudo unlink /usr/bin/java
IGNORE THE BELOW ONCE:
Goto the extracted ‘folder > bin’ directory copy the full path (eg: /Downloads/node/bin) by opening terminal and using the command ‘pwd’ ( means print working directory)
Open bashrc and edit it
vi ~/.bashrc
Press insert or i and goto end of the file and add below command:
export PATH=${PATH}:/home/praveen/Downloads/node-v10.16.0-linux-x64/bin/
Note : After ${PATH} , use the location of the node bin folder that you have used
Note: you can also edit /etc/profile instead bashrc, bashrc settings is applicable only for bash scripts. Profile settings will be available across different shells.
Press escape and type :wq
Close the terminal and open again:
Reboot system to reflect the changes.
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