Linux on Time Friend

Centos7 How to Use yum to Upgrade Git to Latest Version

Mon, 24 Dec 2018 20:32:05 +0000

yum upgrade Cannot Upgrade Git to Latest Version

In CentOS7, the default git version is 1.8.x

Check Local Git Version

git --version
git version 1.8.3.1

If you want to use yum to upgrade to 2.0+ version

Direct yum Upgrade Won’t Upgrade to Latest Version

yum -y upgrade git
git version 1.8.3.1

But I don’t want to download source package, compile on local machine and export environment variables that way. Still too troublesome.

Linux - CentOS Timezone Setting

Mon, 30 Jul 2018 20:32:05 +0000

timedatectl Command

Check Current Timezone Status

$ timedatectl status
 Local time: Fri 2018-08-31 13:42:42 CST
 Universal time: Fri 2018-08-31 05:42:42 UTC
 RTC time: n/a
 Time zone: Asia/Shanghai (CST, +0800)
 NTP enabled: n/a
NTP synchronized: yes
 RTC in local TZ: no
 DST active: n/a

Set Timezone to Shanghai

$ timedatectl set-timezone Asia/Shanghai # Set system timezone to Shanghai

Other Operations

$ timedatectl list-timezones # List all timezones

$ timedatectl set-local-rtc 1 # Adjust hardware clock to match local clock, 0 means set to UTC time

Linux - SSH Connect to Remote Server Directly Execute Command PATH Incomplete Solution

Thu, 15 Mar 2018 20:32:05 +0000

PATH Incomplete in non-interactive mode

ssh username@desktop.domain ‘command’ is a typical non-interactive shell, PATH incomplete.

Reason

A common way to determine if it’s an interactive shell in Linux systems is through the PS1 variable. Although there are other ways, currently .bashrc determines if it’s interactive mode through PS1.

# .bashrc file
# If not running interactively, don't do anything 
[ -z "$PS1" ] && return

Solution

Move all necessary export PATH declarations before [ -z “$PS1” ] && return. Ensure PATH settings also take effect in non-interactive mode.

Linux - vim vi Learning Notes

Sat, 17 Feb 2018 20:32:05 +0000

Often on Mac or Linux, because we frequently need to use it, but its operations differ greatly from other editors, so I’ll specifically learn it. When using it, won’t be too confused. In learning, need to practice more and use more to become proficient.

Three Modes of vim/vi

Command mode
Insert mode
Last line mode

Command Mode

When we use vim to open a file, we enter command mode. In command mode, we cannot input/edit text. In command mode, we can input the following to switch to other modes

Linux - Install Nginx Steps

Tue, 16 Jan 2018 20:32:05 +0000

yum install gcc
yum install pcre-devel
yum install zlib zlib-devel
yum install openssl openssl-devel

Of course you can also install together

yum -y install gcc zlib zlib-devel pcre-devel openssl openssl-devel

Download Nginx tar Archive

Go to webpage http://nginx.org/download/

Choose the version you need:

 # Enter local folder
 cd /usr/local

 # I chose a relatively new version, download to current directory
 wget http://nginx.org/download/nginx-1.13.9.tar.gz

 # Extract
 tar -xvf nginx-1.13.9.tar.gz

 # Rename
 mv nginx-1.13.9.tar.gz nginx

 # Enter nginx directory
 cd nginx

 # Execute following commands
 ./configure

 # Compile
 make

After completing the above steps, your nginx is already installed

Linux - Use ssh-copy-id Command to Achieve SSH Passwordless Login

Sat, 16 Dec 2017 20:32:05 +0000

1. Generate Public and Private Keys

ssh-keygen -t rsa

After entering according to prompts, will generate id_rsa and id_rsa.pub files in ~/.ssh directory

2. Establish Connection with Server

ssh-copy-id root@192.168.0.100 //Example IP

Next will require entering connection password, after successful verification

Try the following command to see if login succeeds directly:

ssh root@192.168.0.100

It’s that simple