admin 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
To find all Debian managed configuration files which have been changed from the default you can use a command like this. dpkg-query -W -f=”${Conffiles}\n” ‘*’ | awk ‘OFS=” “{print $2,$1}’ | md5sum -c 2>/dev/null | awk -F’: ‘ ‘$2 !~ /OK/{print $1}’ Edit (works with localized systems): dpkg-query -W -f=”${Conffiles}\n” ‘*’ | awk ‘OFS=” “{print … Read more
The pvdisplay command has a -m option to show the mapping of physical extents to logical volumes and logical extents. I have set up the following situation on a test machine: 3 disks of 1GB each added to the system and used as physical volumes for vg_test 6 logical volumes made with various sizes (ranging … Read more
There are pro’s and con’s for either pw or key-based authentication. In some cases, for example, key-based authentication is less secure than password authentication. In other cases, its pw-based that’s less secure. In some cases, one is more convenient, in others, less. It all boils down to this: When you do key-based authentication, you must … Read more
0 0,4,8,12,16,20 * * * /cmd.sh That’s probably how I would do it. This will run the job every 4 hours, on the hours of 00:00, 04:00, 08:00 12:00, 16:00, 20:00. This is just a little more verbose way of writing */4, but it should work the same.
I’ve found XFS more well suited to extremely large filesystems with possibly many large files. I’ve had a functioning 3.6TB XFS filesystem for over 2 years now with no problems. Definately works better than ext3, etc at that size (especially when dealing with many large files and lots of I/O). What you get with ZFS … Read more
Necromancing, but adding the following to your sshd_config should do the trick: Match User <username> PasswordAuthentication yes Match all Note that match is effective “until either another Match line or the end of the file.” (The indentation isn’t significant.)
Unfortunately not directly. rsync requires a clean link with a shell that will allow it to start the remote copy of rsync, when run this way. If you have some way of running long-lived listening processes on the host you could try starting rsync manually listening for connections on a non-privileged port, but most techniques … Read more
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