maximum number of open files and file descriptors in linux
To see open files in linux use the command lsof There is a limit set in the kernel on how many open…
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lighttpd too many open files
lighttpd server crashes with fllowing error in error_log file. 2019-11-05 09:39:02: (network_linux_sendfile.c.143) open failed: Too many open files 2019-11-05 09:39:02: (connections.c.603) connection…
df not showing all mounts
On a server, df not showing all mounts root@server20 [~]# df -h Filesystem Size Used Avail Use% Mounted on tmpfs 3.9G 0…
Show disk usage with df
df command shows partitions and disks used by each partition. root@server54 [~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/sda2…
RHCSA Study Guide
1. Logical volume ‘home’ as created and mounted. Reduce its size to ‘192M’ (size from 185M to 200MB is acceptable) # lvdispaly…
MySQL ERROR Access denied you need SUPER privilege for this operation
WHen restoring a MySQL database, i get following error root@ns3043014:~# mysql -u NEW_DB_USER -p’PASSOWRD_HERE’ DB_NAME < BACKUP_FILE.sql ERROR 1227 (42000) at line…
debconf: unable to initialize frontend: Dialog
When installing a program in Ubuntu 18.04 server minimal installation, i get following error debconf: unable to initialize frontend: Dialog debconf: (No…
Install Unbound DNS caching server
Unbound is an Open source DNS caching and recursive resolver. You can find more about unbound at https://nlnetlabs.nl/projects/unbound/about/ To install unbound on…
Start x11vnc with supervisord
To auo start x11vnc with supervisord, first install x11vnc and supervisord apt -y install supervisor x11vnc Create a password file x11vnc -storepasswd…
Oracle Cloud
https://www.oracle.com/cloud/free/ – Every free account have 2 servers free for life. Only for development purpose. Allow ICMP (ping) in Oracle Cloud Updating…
Allow ICMP (ping) in Oracle Cloud
Oracle cloud do not allow ICMP/ping to compute instances. To enable ping, you need to enable ICMP in the security group. On…