Managing Security Profiles in AlmaLinux
To manage security profile, in this case, to accept legacy SSH keys: echo “PubkeyAcceptedKeyTypes=+ssh-dss” >> /etc/ssh/sshd_config update-crypto-policies –set legacy
Categories Archives Uncategorized
Monitoring files read/written on Linux
apt install fatrace ./fatrace
California Audio Labs CL2500-MCA Repair Saga
The CL2500-MCA 5-channel amplifier is one of the most powerful home audio amplifiers. For sale between 1999 and 2001, it had a short retail life and few were sold until California Audio Labs ceased operations. There are no parts, schematics or service manuals. Under the hood, you’ll find a low voltage / standby power supply […]
.htaccess force SSL (AutoSSL safe)
The following is safe to use on Cpanel/WHM with AutoSSL enabled. RewriteEngine On RewriteCond %{HTTPS} !on RewriteCond %{REQUEST_URI} !^/[0-9]+\..+\.cpaneldcv$ RewriteCond %{REQUEST_URI} !^/\.well-known/pki-validation/[A-F0-9]{32}\.txt(?:\ Comodo\ DCV)?$ RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]
JunOS (MX) Cheat Sheet
BGP Commands BGP Summary (IPv4 and IPv6): show bgp summary BGP Received routes (shows routes BEFORE filtering? Always check local routing table): show route receive-protocol bgp <neighbor> BGP Sent routes: show route advertising-protocol bgp <neighbor> Shut/unshut a BGP peer <set|delete> protocols bgp <group> neighbor <neighbor> shutdown Reload inbound routes clear bgp neighbor soft-inbound <neighbor|all> Reload […]
Starting a temporary MySQL instance for table/DB recovery
In this example we assume a restored backup of mysql’s datadir exists at /mnt/restore/mysql. mysqld –port=3307 –socket=/mnt/restore/mysql/tmp.sock –datadir=/mnt/restore/mysql –pid-file=/mnt/restore/mysql/tmp.pid –user=mysql If the backups are ‘dirty’ and innoDB corruption won’t let it start, you can try –innodb-force-recovery=N if needed (start with N = 1 and go up to 4 as neccesary). If the instance was part […]
XenServer recovery – XAPI won’t start
If running XenServer on a RAID array with writeback (controller cache) enabled and no battery backup, don’t lose power. If you do, you will discover the state.db is corrupt and XAPI fails to start. Everything is down, Dom0 lost it’s network config, you’re screwed. Maybe. This tutorial assumes you’ve got a metadata backup, all your […]
Windows Vista through Windows 10 Boot Repair
After cloning a larger HDD to a smaller SSD, you will most likely face a blinking cursor or other boot issues. The following steps should get you back on track from a rescue command prompt: bootrec.exe /fixmbr bootsect.exe /nt60 all /force bootrec.exe /rebuildbcd If you are getting integrity check errors on winload.exe, you can try […]
Grub with Xen Guests
In order for grub to ‘see’ virtual disks, you have to tell it about them with the ‘device’ command: # grub grub> device (hd0) /dev/xvda grub> root (hd0,0) grub> setup (hd0) grub> quit Keep in mind, installing grub on the MBR is not always necessary with Xen PV guests, but is highly useful for V2P […]
XenServer 6.2 with Software RAID
Historically XenServer does not support software RAID out-the-box, and this is unchanged in the latest 6.2 release. We can convert it to RAID after installation. First we set up the 2nd disk by copying the partition tables whilst enabling a degraded RAID on it, then copy data over with custom initrd. sgdisk -R/dev/sdb /dev/sda # […]