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When connecting to VNC either screen is black or icons are shown but no menu or screen background

This issue occurs due to changes in the default service unit file. The changed file which is causing the error is given below; [Service] Type=forking User=<USER> # Clean any existing files in /tmp/.X11-unix environment ExecStartPre=-/usr/bin/vncserver -kill %i ExecStart=/usr/bin/vncserver %i PIDFile=/home/<USER>/.vnc/%H%i.pid ExecStop=-/usr/bin/vncserver -kill %i The correct file is shown below; [Service] Type=forking # Clean any existing …

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How to limit per user VNC sessions count?

You can use the following PERL script to limit VNC sessions per user. Create a new file name vncserver and add the following content. # Start the VNC Server # Maximum sessions is limited to 2 per user in server. &vnclimit(); } } sub vnclimit { $countoutput = `ps -u $ENV{USER} | grep -i Xvnc …

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How to setup FTP in Linux based server

Login to the server as root and install vsftpd with yum install vsftpd ftp -y Use vi editor to open /etc/vsftpd/vsftpd.conf [vi /etc/vsftpd/vsftpd.conf] and add/change following options: anonymous_enable=NO ascii_upload_enable=YES ascii_download_enable=YES use_localtime=YES Enable and start the vsftpd service. systemctl enable vsftpd systemctl start vsftpd Allow the ftp service and port 21 via firewall. firewall-cmd --permanent --add-port=21/tcp …

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How to configure a bonding device in a Linux server

Multiple bonding modes in a Linux operating system are given below: balance-alb (fault tolerance and load balancing) balance-tlb (fault tolerance and load balancing) active-backup (fault tolerance) broadcast (fault tolerance) balance-rr (fault tolerance and load balancing) 802.3ad (fault tolerance and load balancing) balance-xor (fault tolerance and load balancing) We will use Network Manager CLI to add …

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Kickstart fails to form boot partition [Not enough space in filesystems for the current software selection]

The kickstart automatic installation of the Linux operating system fails but the normal install is successful. To resolve this issue follow the steps given below: Add clearpart --all --drives=${devname} --initlabel in kickstart disk section. This will delete partition table of disk. If the above option does not resolve the issue add zerombr option above clearpart …

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How to enable audit for file on nfs server?

Add -w /NFS-MOUNT/ -p wa -k NFS-MOUNT line at the end of file /etc/audit/audit.rules [root@COMPUTE ~]# cat /etc/audit/audit.rules ## This file is automatically generated from /etc/audit/rules.d -D -b 8192 -f 1 -w /NFS-MOUNT/ -p wa -k NFS-MOUNT Execute the following command to restart auditd service service auditd restart

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SELinux prevents /usr/lib/cups/daemon/cups-lpd from read access on the sock_file cups.sock in Linux server

In spite of /usr/lib/cups/daemon/cups-lpd denial to read access sock_file cups.sock, cups-lpd will successfully migrate print jobs received via LPD to the local CUPS server. You can either ignore this issue or create a custom SELinux policy module. The steps to create a custom SELinux policy module are listed below: yum -y install setools-console yum-utils policycoreutils-devel …

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