By default Ubuntu doesn’t specify a ServerName in the Apache configuration, because it doesn’t know what the name of your server is. It tries a reverse lookup on your IP address, which returns nothing, so it just has to use the IP address as the ServerName. To fix it, either add a ServerName directive outside … Read more
Even if you don’t use a Nagios monitoring server, you can grep the check_dhcp binary or compile it from source and use the check to test a DHCP-Server. E.g. ./check_dhcp -v -s <dhcp_server_address> -r <expected_ip_address> -m <mac_address_touse>
It turns out my key was not in the agent, and this fixed it: OS X: ssh-add -K Linux/Unix: ssh-add -k You can list loaded keys using: ssh-add -l ssh-add -L # for more detail
I currently work in an environment that has used Linux for more than a decade. Everybody in the office uses different distros on their desktops as well as the servers. As such, the choices of distribution tend to revolve around a number of things in no particular order: History – Obviously systems like RedHat and … Read more
What is debian-sys-maint used for? One major thing it is used for is telling the server to roll the logs. It needs at least the reload and shutdown privilege. See the file /etc/logrotate.d/mysql-server It is used by the /etc/init.d/mysql script to get the status of the server. It is used to gracefully shutdown/reload the server. … Read more
The .crt file is sent to everything that connects; it is public. (chown root:root and chmod 644) To add to the private key location; make sure you secure it properly as well as having it in there. (chown root:ssl-cert and chmod 640)
You can use pre-seeding for this, using the debconf-set-selections command to pre-answer the questions asked by debconf before installing the package. For example: debconf-set-selections <<< “postfix postfix/mailname string your.hostname.com” debconf-set-selections <<< “postfix postfix/main_mailer_type string ‘Internet Site'” apt-get install –assume-yes postfix
I was in a similar situation; fully managed dedicated server, LAMP, CentOS. Then we decided to move to EC2. Also, I had very little systems or linux administration experience. I have almost zero experience with Ubuntu, so I really cannot speak to which is the so-called better OS. I tried a bunch of pre-built AMI’s … Read more
[Fri Nov 29 17:35:43.942472 2013] [core:warn] [pid 14655] AH00111: Config variable ${APACHE_LOCK_DIR} is not defined This message is displayed because you directly executed the apache2 binary. In Ubuntu/Debian the apache config relies on the envvar file which is only activated. If you start apache with the init script or apachectl. Your original problem is that … Read more
You can use: > /var/log/mail.log That will truncate the log without you having to edit the file. It’s also a reliable way of getting the space back. In general it’s a bad thing to use rm on the log then recreating the filename, if another process has the file open then you don’t get the … Read more