In the good old days you are used ifdown and ifup and so you can bring up a network interface. Now you have systemd and you should use networkctl
networkctl list => show all interfaces
networkctl down eht0
shutdown interface
networkctl up eht0
bring up interface
https://manpages.ubuntu.com/manpages/kinetic/en/man1/networkctl.1.html
the last day I have this error very often on my old 6.7 VMware environment.
shutdown your vm, remove all network cards / nic => save
edit settins add new network cards /nic
dmidecode | grep--color -i serial
how to install manually
https://www.tecmint.com/install-apache-tomcat-on-debian-10/
but we want to compile itself and build a deb package
we need java and ant
apt-get install ant
Choose your version as source code https://github.com/apache/tomcat/tags in our example we use 9.0.64
extract the folder and you can run /usr/bin/ant in the extraced tomcat folder after a frew seconds you can find your compiled tomcat under the folder /output/build
apt build-dep tomcat9
dpkg-buildpackage -rfakeroot -b -uc -us
MariaDB and MySQL sometimes realy strange. The last time I had offen dumps between sql server versions. you must not use my pipe for compression this is optional.
mysqldump –events –routines –triggers –single-transaction –default-character-set=utf8mb4 –opt database.dump | gzip > database.sql.gz
If you are need some stresstest for your MySQL server you can use mysqslap. I offen use this command
mysqlslap --auto-generate-sql --concurrency=100 --iterations=200
If you are searching for an alternative for Backblaze Backup. You can try rclone with s3 storage from Scaleway.
In these Blogpost you can find out how to install and configure it. But how to use it? I have some example for you.
https://www.scaleway.com/en/docs/tutorials/encrypt-s3-data-rclone/
https://www.scaleway.com/en/docs/storage/object/api-cli/installing-rclone/
Thats for a Windows machine, on Linux only other path K:test = /home/ubuntu/myfiles
rclone sync --progress K:\test Scaleway:allmybackup
If you want to store your data directly in to the GLACIER storage you can use
rclone sync --progress --s3-storage-class=GLACIER K:\test Scaleway:allmybackup
or you can configre rclone directly to use GLACIER directy without define storage class
Simple example if you are using encryption with rclone
rclone sync --progress K:\test crypt:
Now we have more options for bandwith usage
Attention rclone is using Megabyte not Megabit 1M are 8Mbit
rclone sync --progress --log-file=rclone_log.txt --bwlimit "06:00,2M 23:00,4M" K:\test crypt:
If you have a SQL cluster under heavy load you can use proxy sql but is nowhere an alternative software? Of course last month was publish ReadySet comes with a nice a GUI to analyze your cache.
If you have multi servers Linux Distribution and should check only Ubuntu. Then you can use this script to select the os and if only match the OS then execute the command.
##!/bin/bash
if [ -e "/etc/issue" ] ;
then
issue=`cat /etc/issue`
set -- $issue
if [ $1 = "Ubuntu" ] ;
then
nginx -v 2>&1 | grep -o 1.* | cut -c1-6
fi
fi
If you are using Magento 2 and you got this 500 error from admin login page. Your Content Security Policy header are too long. Use Nginx or reduce your headers.
Problem is AP_IOBUFSIZE cannot be changed by a conf file it is hardcoded in to the sourcecode. You have only 8192 Bytes and this os offen to low. If you reach this limit your apache will crash and restart.
AP_IOBUFSIZE 8192
Look at the Bugzilla from Apache Webserver
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