I was writing a script to scrub a server prior to decommissioning, something simple that would just make the disks unusbale enough that someone couldnt boot the OS or easily read the data. This is by no stretch a comprehensive disk wipe, if someone is lookign to recover data from these disks what were are doing here is …

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To view the contetns of a fiule but remove comments and new lines you can use this excellent little command. It will remove all lines that start with # or a new line, this is particulaly useful for viewing a config file that has 99% comments and a handful of actual values(E.G OpenStack config files) grep -v -e …

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If you want to diagnose HTTP traffic it's sometime usefull to use tcpfump to dump the packets either on the console or to a tile Here is a nice litte command I found to run a dump of all http traffic on a defined port tcpdump -A -s 0 'src 10.10.110.254 and tcp port 5000 and (((ip[2:2] - ((ip[0]&0xf)<<2)) - …

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I was writing a script to interact with all local disks and i needed a simplied list of local disks, not partitions and not the loopback mounts..This is what I came up with lsblk -d | cut -f 1 -d" " | tail -n +2 | grep -v loop Which will give you a nice parseable output something like this 1sda 2sdb 3nvme0n1 …

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The MaaS CLI documentation is a bit trash Login to MaaS maas login admin http://10.10.110.250:5240/MAAS/api/2.0/ 5HvxATpW5487XmkSjZ:CXfC3McdvV9U9aefbp:wB9jGT8AJ4DUYArJ8dDqeRVczBwJEXMk Set the IPMI Cipher Suite ID to 'freeipmi-tools default' maas admin machine update bfyq3e power_parameters_cipher_suite_id='' Commission …

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bmon Nethogs Glances Warning dependency heavy

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I always forget how to mount the subfolder of a CephFS filesystem sudo ceph-fuse -m 192.168.2.9:6789 -r /subfolder /folder/on/my/machine Note: The proceeding / after the -r is important Some great info here on restricting access to specific folders and more notes on mounting …

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Nmap Scan subnet for PTR's When you need to scan an entire subnet for 'research purposes' and check for any associated PTR's we can use Nmap   nmap -R -sL 103.112.200.0/22 > results.txt

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I use this script on my CA server to create a certificate for each new server we provision. This allows our internal PKI to function. This script creates a certificate then copies it to the Ansible server where is can be deployed to the destination host Obviously you'll need to take the necessary precautions around key …

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Example 1 - Includes some static routes and manually specified IP's auto lo iface lo inet static address 103.90.59.9/32 auto ens3 iface ens3 inet static address 172.2.1.17 network 172.2.1.0 netmask 255.255.254.0 up route add -net 172.2.0.0 netmask 255.255.0.0 gw 172.2.1.1 up route add -net 172.2.0.0 netmask 255.255.0.0 …

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