To open up a new port (e.g., 80,21,22,3306 ) permanently, use these commands.
sudo firewall-cmd --zone=public --add-port=80/tcp --permanent sudo firewall-cmd --zone=public --add-port=3306/tcp --permanent sudo firewall-cmd --zone=public --add-port=21/tcp --permanent sudo firewall-cmd --zone=public --add-port=22/tcp --permanent sudo firewall-cmd --reload
Without “–permanent” flag, the firewall rule would not persist across reboots.
Check the updated rules with
$ firewall-cmd --list-all
Edit the file /etc/sysconfig/network-scripts/ifcfg-eth0 and Change the ONBOOT line’s value to ‘yes’
You can change / rename the username using the below command.
usermod -l login-name old-name
The name of the user will be changed from old-name to login_name. Nothing else is changed. In particular, the user’s home directory name should probably be changed to reflect the new login name.
Make sure system is uptodate.
yum -y update
Chnage the directory to tmp and run the follwing commands.
cd /tmp/ curl -sS https://getcomposer.org/installer | php mv composer.phar /usr/local/bin/composer chmod +x /usr/local/bin/composer
Now you can check the composer version as follows
[root@localhost bin]# composer -V Composer version 1.6.5 2018-05-04 11:44:59
Step 1. Crate Group
groupadd sftponly
Step 2. Create user account
useradd -d /home/sftp/MYUSER -s /bin/false -G sftponly MYUSER
Step 3. Create a password for your username.
passwd MYUSER
Step 4. Ensure the following line is commented out in your sshd configuration file ( File Location: /etc/ssh/sshd_config )
# Edit the sshd_config file which holds the SSH/SFTP configuration
vi /etc/ssh/sshd_config
# Ensure this below Line has a hash symbol, # in front of it
#Subsystem sftp /usr/lib/openssh/sftp-server
# Ensure that this below line is added directly below the line you just commented out with a hash symbol #
Subsystem sftp internal-sftp
Step 5. Add the following to the bottom of the same file (it must be at the very bottom)
Match Group sftponly
ChrootDirectory %h
X11Forwarding no
AllowTCPForwarding no
ForceCommand internal-sftp
Step 6. Test the changes with sshd before restarting the service, please note it’s important you do this correctly, or may break your sshd configuration
sshd -t
service sshd restart
Step 7. Give proper ownership to the newly created folder
chown root:root /home/sftp/MYUSER
Step 8. Test SFTP credential is working:
# Connect to SFTP using the myuser, replace myuser with the user you’ve chosen
sftp myuser@localhost
myuser@localhost’s password:
tar -czvf name-of-archive.tar.gz name-of-the-file-to-be-compressed
-c: Create an archive.
-z: Compress the archive with gzip.
-v: Display progress in the terminal while creating the archive(verbose mode).
-f: Allowsto specify the filename of the archive.
Log in to your account using SSH and change to the directory where the apache logs available.
Then issue the command given below.
awk ‘{print $1}’ access.log | sort | uniq -c | sort -n | tail -n 10
Check File System Disk Space Usage : df
Display Information of all File System Disk Space Usage : df -a
Show Disk Space Usage in Human Readable Format : df -h
Display Information of /home File System : df -hT /home
Display Information of File System in Bytes : df -k
Display Information of File System in MB : df -m
Display Information of File System in GB : df -h
Display File System Inodes : df -i
Display File System : df -T
Include Certain File System : df -t ext
Exclude Certain File System : df -x ext
Display Information of df Command: df --help
Install the CompizConfig Settings Manager (CCSM).
Hit Alt-F2 and input about:config and hit enter.
add-apt-repository ppa:webupd8team/sublime-text-2
apt-get update
apt-get install sublime-text-2