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--- system_administration:faq [2022/11/30 12:54] – aziz
+++ system_administration:faq [2023/08/11 20:01] (current) – aziz
@@ Line 1: / Line 1: @@
+===== FAQ =====
 ~~FAQ~~
+??? Rendre persistant le journal system
+!!!
+<cli>
+$ sudo mkdir -p /var/log/journal
+$ grep -v '^#' /etc/systemd/journald.conf
+[Journal]
+Storage=persistent
+SystemMaxUse=300M
+$ sudo systemctl restart systemd-journald.service
+</cli>
+??? journalctl --list-boots Failed No data available
+!!!
+<cli>
+$ LANG=C sudo journalctl --list-boots
+Failed to determine boots: No data available
+$ sudo journalctl --verify
+File corruption detected at /var/log/journal/c56cd17c662e3fc8c875401c5a259b37/system@0005f368d2135b48-c23b051fd742a581.journal~:25efd0 (of 838860
+bytes, 29%).
+FAIL: /var/log/journal/c56cd17c662e3fc8c875401c5a259b37/system@0005f368d2135b48-c23b051fd742a581.journal~ (Message invalide)
+$ # remove corrupted files
+$ sudo rm /var/log/journal/c56cd17c662e3fc8c875401c5a259b37/system@0005f368d2135b48-c23b051fd742a581.journal~
+</cli>
 ??? Convertir un CD en fichier ISO
 !!!
-<code ->
+<cli>
   [root@testserver ~]# isoinfo -d -i /dev/cdrom | grep -i -E 'block size|volume size'
   Logical block size is: 2048
@@ Line 9: / Line 35: @@
   [root@testserver ~]# dd if=/dev/cdrom of=test.iso bs=<block size from above> count=<volume size from above> status=progress
-</code>
+</cli>
 - Sources :
@@ Line 19: / Line 45: @@
 ??? Réduire la taille d'un PDF
 !!!
-<code ->
+<cli>
-ps2pdf -dPDFSETTINGS=/ebook input.pdf output.pdf
+$ ps2pdf -dPDFSETTINGS=/ebook input.pdf output.pdf
-</code>
+</cli>
 Les autres  alternatives de l'option ''-dPDFSETTINGS''  sont ''/prepress'' et ''/printer''.
@@ Line 31: / Line 57: @@
 !!!
-<code bash>
+<cli>
-convert logo_elosys.png -resize  128x128 logo.png
+$ convert logo_elosys.png -resize  128x128 logo.png
-</code>
+</cli>
@@ Line 39: / Line 65: @@
 !!!
-<code bash>
+<cli>
-convert -resize x48 -gravity center logo.png -flatten -colors 256 -background transparent favicon.ico
+$ convert -resize x48 -gravity center logo.png -flatten -colors 256 -background transparent favicon.ico
-</code>
+</cli>
-??? Pusher en utilisant une clé ssh spécifique
+??? Pusher avec GIT en utilisant une clé ssh alternative
 !!!
 <cli>
-GIT_SSH_COMMAND='ssh -i id_rsa' git push origin master
+$ GIT_SSH_COMMAND='ssh -i id_rsa' git push origin master
 </cli>
@@ Line 80: / Line 106: @@
 slave si les commande suivantes ne sont pas exécutées:
-<code bash>
+<cli>
-sudo rndc freeze
+$ sudo rndc freeze
-sudo rndc thaw
+$ sudo rndc thaw
-</code>
+</cli>
+??? Obtenir le log de bind9 nameserver
+!!!
+<cli>$ sudo journalctl -f -u bind9</cli>
@@ Line 93: / Line 124: @@
 **Step 1 - Enable NBD on the Host**
-<code bash>modprobe nbd max_part=8</code>
+<cli>$ modprobe nbd max_part=8</cli>
 **Step 2 - Connect the QCOW2 as network block device**
-<code bash> qemu-nbd --connect=/dev/nbd0 /var/lib/vz/images/100/vm-100-disk-1.qcow2</code>
+<cli>$ qemu-nbd --connect=/dev/nbd0 /var/lib/vz/images/100/vm-100-disk-1.qcow2</cli>
 **Step 3 - Find The Virtual Machine Partitions**
-<code bash>fdisk /dev/nbd0 -l</code>
+<cli>$ fdisk /dev/nbd0 -l</cli>
 **Step 4 - Mount the partition from the VM**
-<code bash>mount /dev/nbd0p1 /mnt/somepoint/</code>
+<cli>$ mount /dev/nbd0p1 /mnt/somepoint/</cli>
 **Step 5 - After you're done, unmount and disconnect**
-<code bash>
+<cli>
-umount /mnt/somepoint/
+$ umount /mnt/somepoint/
-qemu-nbd --disconnect /dev/nbd0
+$ qemu-nbd --disconnect /dev/nbd0
-rmmod nbd
+$ rmmod nbd
-</code>
+</cli>