blog
Table des matières
3 billet(s) pour janvier 2026
| Notes rsh rcp | 2026/01/21 18:08 | Jean-Baptiste |
| Git - Duplication d'un dépôt | 2026/01/19 10:22 | Jean-Baptiste |
| Exemple simple de conf Nagios | 2026/01/14 10:07 | Jean-Baptiste |
Telnet vieux Unix console delete backspace
Pour faire backspace
[CTRL] + [H]
Ou pour avoir un terminal “normal”
bash
Taille fichiers sur disque du ls sparse
Voir : https://wiki.archlinux.org/index.php/Sparse_file
Sparse, fichiers à trous
Voir du dh “ls -s” fallocate truncate
Notes :
du -sh /var/lib/libvirt/images/dic01-disk0 2,0G /var/lib/libvirt/images/dic01-disk0 ls -lh /var/lib/libvirt/images/dic01-disk0 -rw-r--r-- 1 qemu qemu 120G 20 juin 14:53 /var/lib/libvirt/images/dic01-disk0
$ ls -lsh total 22G 16K drwx------ 2 root root 16K août 9 10:42 lost+found 7,7G -rw-r--r-- 1 jibe jibe 120G août 9 11:18 VM152-SUPPMSM-V-clone.img 14G -rw-r--r-- 1 jibe jibe 14G févr. 24 09:15 VM152-SUPPMSM-V-clone.qcow2
$ du -h VM152-SUPPMSM-V-clone.* 7,7G VM152-SUPPMSM-V-clone.img 14G VM152-SUPPMSM-V-clone.qcow2
Unsparse
cp --sparse=never VM152-SUPPMSM-V-clone.raw VM152-SUPPMSM-V-clone_copy.raw
Ou
truncate -c -s $(( 1024 * 1024 + 1024 * $(ls -s VM152-SUPPMSM-V-clone.raw |awk '{print $1}') )) VM152-SUPPMSM-V-clone.raw
NOTES
Source : https://softwarebakery.com/shrinking-images-on-linux
fdisk -l myimage.img
Disk myimage.img: 6144 MB, 6144000000 bytes, 12000000 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000ea37d
Device Boot Start End Blocks Id System
myimage.img1 2048 9181183 4589568 b W95 FAT32
Note two things in the output:
- The partition ends on block 9181183 (shown under End)
- The block-size is 512 bytes (shown as sectors of 1 * 512)
truncate --size=$[(9181183+1)*512] myimage.img
Autres
rsync
rsync : Voir l'option --sparse
-S, --sparse traite les fichiers à trous efficacement
cp
cp --sparse=always et --sparse=never
Taille des bases MySQL/MariaDB
Source : https://stackoverflow.com/questions/1733507/how-to-get-size-of-mysql-database
SELECT table_schema "DB Name", ROUND(SUM(data_length + index_length) / 1024 / 1024, 1) "DB Size in MB" FROM information_schema.tables GROUP BY table_schema;
Système de fichier en lecture seule - read only filesystem
https://unix.stackexchange.com/questions/195010/remount-a-busy-disk-to-read-only-mode
echo u > /proc/sysrq-trigger # paquet util-linux fsfreeze -f / fsfreeze -u / echo 1 >/sys/block/dm-4/ro echo 1 >/sys/block/sda/sda2/ro
# LANG=C fdisk /dev/sdb Welcome to fdisk (util-linux 2.33.1). Changes will remain in memory only, until you decide to write them. Be careful before using the write command. fdisk: cannot open /dev/sdb: Read-only file system # hdparm -r0 /dev/sdb /dev/sdb: setting readonly to 0 (off) readonly = 0 (off)
Read only for one process
Autres
Svn erreur svn cannot negotiate authentication mechanism
Erreur
$ svn checkout svn://hack.me:3600/Projets/Web/foo/trunk svn: E210007: Unable to connect to a repository at URL 'svn://hack.me:3600/Projets/Web/foo/trunk' svn: E210007: Impossible de négocier de mécanisme d'authentification
ou
$ svn info svn://hack.me:3600/Projets/Web/foo/trunk svn: E170013: Unable to connect to a repository at URL 'svn://hack.me:3600/Projets/Web/foo/trunk' svn: E210007: Cannot negotiate authentication mechanism
Solution
Sous Debian
sudo apt-get install libsasl2-modules
Sous RedHat7 / CentOS7
sudo yum install cyrus-sasl-md5
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