Differences

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--- software:linux [2016/01/11 16:02] – [Backup a lot of data from a remote (not directly accessible) VM with minimum overhead] Michele Porelli
+++ software:linux [2024/05/20 21:40] (current) – [Useful commands] Michele Porelli
@@ Line 12: / Line 12: @@
   * [[http://www.torino19.org/mike/pool/apt/fixgpgkeys|script]] to fix GPG keys errors
   * Manual remove of a package (last resort!!)
-  - First try:<code>dpkg -P --force-all nagios-common</code>
+  - The cleanest way to remove the package is:<code>dpkg -P --force-all nagios-common</code>
-  - If still no joy:<code>List the package contents and take a note of this list
+  - If the process fails:<code>List the package contents and take a note of this list
 $ dpkg -L nagios-common
@@ Line 27: / Line 27: @@
 to finish up, remove all files you found previously with 'dpkg -L'</code>
   * [[http://snipplr.com/view/13856/remove-all-rc-files-as-listed-in-dpkg/| Remove remaining configuration of all packages uninstalled]]
+    * <code>apt list | grep 'residual-config'</code>
+    * <code>sudo aptitude purge ~c</code>
   * [[http://www.linuxcertif.com/man/1/dlocate/|dlocate]] is a really useful software to find which installed package provide a file on your system
   * [[http://alioth.debian.org/projects/cruft/|cruft]] search for orphans files (not unpacked by dpkg)
@@ Line 69: / Line 71: @@
 search "ao=alsa" and replace it with "ao=pulse"</code>
   * To automatically mount NFS shares at boot time put in /etc/default/rcS<code>ASYNCMOUNTNFS="no"</code>
+  * [[https://openzfs.github.io/openzfs-docs/Getting%20Started/Debian/Debian%20Buster%20Root%20on%20ZFS.html|Install Debian Buster using ZFS as RootFS]]. If you face problems with the rootfs not being found, you may want to increase the sleep time in initrd [[https://forum.proxmox.com/threads/failed-to-import-rpool-on-bootup-after-system-update.37884/post-273229|as described here]].
 ===== Kernel related =====
   * [[http://www.makelinux.net/kernel_map/|Interactive kernel map]]
@@ Line 108: / Line 110: @@
 <code>sudo dnsmasq -i eth0 -d --dhcp-range=192.168.89.90,192.168.89.100</code>
 ==== Quick HTTP server ====
-<code>python -m SimpleHTTPServer 8000</code>
+<code>python -m SimpleHTTPServer 8000
+python3 -m http.server 8080</code>
 ==== Quick FTP server ====
@@ Line 116: / Line 119: @@
   * [[http://ubuntuforums.org/showthread.php?t=869801&page=2|Change UUID of a NTFS partition]]
   * [[http://linuxaria.com/howto/7-hidden-features-of-bash?lang=it#|7 bash <del>hidden</del> not well known features]] - (Available only in Italian)
+  * [[http://man7.org/linux/man-pages/man1/fallocate.1.html|fallocate - preallocate or deallocate space to a file (Immediately!)]]
   * Scheduled shutdown/hibernate<code># shutdown -h +X     # X = minutes to wait before shutdown
 # shutdown -h 23:20     # 23:20 = hh.mm, system wait until system clock is 22.30 then shutdown
@@ Line 121: / Line 125: @@
 # sleep X ; dbus-send --system --print-reply --dest="org.freedesktop.UPower" /org/freedesktop/UPower org.freedesktop.UPower.Suspend
 method return sender=:1.22 -> dest=:1.125 reply_serial=2     # X = minutes to wait before hibernate</code>
+  * Wait for PID to complete:<code>tail --pid=${PID} -f /dev/null</code>
 ===== How-Tos =====
 ==== External ====
@@ Line 262: / Line 267: @@
   - Connect to server<code>$ ssh user@ip_server -L 1900:ip_vm:1900</code>
   - Then connect to your VM<code>$ ssh user@ip_vm</code>
-  - Start the listener<code>$ tar zc * | nc -l 190</code>
+  - Start the listener<code>$ tar zc * | nc -l 1900</code>
   - Open a new terminal and start the receiver<code>nc localhost 1900 | tar zx</code>
+==== Copy a big amount of data as fast as possible ====
+  * <code>tar cpf - . | pv | (cd /dst; tar xf -)</code>
 ==== Add a disk to extend a LVM logical volume ====
   - Mark your disk/partition as LVM<code># pvcreate /dev/sdX</code>