I received such error 'Cannot add or update a child row: a foreign key constraint fails' when trying to import a new Puppet class (sys_yumversionlock) into Foreman via the smart proxy. Based on the error message, it should be database related. I am not a DBA, but I am interested to give a try, as … Continue reading ERROR 1452 (23000): Cannot add or update a child row: a foreign key constraint fails
Set up Puppet lab in docker
Just finished my first docker set up - building a puppet server and a puppet client in two separate containers. 1) My docker host is Fedora 20. [root@1004521 ~]# cat /etc/system-release Fedora release 20 (Heisenbug) 2) Install docker (https://docs.docker.com/installation/fedora/) [root@1004521 ~]# yum -y install docker-io [root@1004521 ~]# systemctl start docker [root@1004521 ~]# systemctl enable docker … Continue reading Set up Puppet lab in docker
Exclude configuration from puppet central management
In some cases, we need to test a configuration in a server that is managed by Puppet. Besides excluding the server in the manifest file, there are two more ways to do it: 1) Use "chattr +i <file>" to set the file to immunable to prevent even root from changing the file. Use "chattr -i" … Continue reading Exclude configuration from puppet central management
Show public IP in Linux command
In Linux console, run the following command to show the public IP address of the machine. curl echoip.net ; echo
Apache mod_rewrite URL redirect script
I wrote a bash script to automate the Apache (mod_rewrite) URL redirection. It supports 3 types of redirection: - One to One: eg. From http://jackiechen.local/mylab To http://jackiechen.org./mylab - Any to One: eg. From http://jackiechen.local/* To http://jackiechen.org - Any to Any: eg. From http://jackiechen.local/$1 to http://jackiechen.org/$1 The script can be downloaded from here Note: I tested … Continue reading Apache mod_rewrite URL redirect script
