Relecture rapide
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Gregory Colpart
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HowtoDRBD.md
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HowtoDRBD.md
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# Howto DRBD
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Cette documentation concerne DRBD 8.3 (Debian 7 ou backports Debian 6) et DRBD 8.9 (Debian 8).
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<http://drbd.linbit.com/users-guide/>
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<http://drbd.linbit.com/users-guide-8.3/>
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* Documentation : <http://www.drbd.org/en/doc/users-guide-84>
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## Installation
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Debian 8 :
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~~~
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# aptitude install drbd-utils
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# modprobe drbd
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~~~
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Debian 7 ou backports Debian 6 :
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~~~
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# aptitude install drbd8-utils
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# modprobe drbd
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# drbdadm -V
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DRBDADM_BUILDTAG=GIT-hash:\ 5474c321d80250cc61d851220503fdc739490ce9\ build\ by\ pbuilder@marvin\,\ 2016-01-04\ 12:36:34
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DRBDADM_API_VERSION=1
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DRBD_KERNEL_VERSION_CODE=0x080403
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DRBDADM_VERSION_CODE=0x080902
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DRBDADM_VERSION=8.9.2rc1
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# modinfo drbd
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filename: /lib/modules/3.16.0-4-amd64/kernel/drivers/block/drbd/drbd.ko
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alias: block-major-147-*
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license: GPL
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version: 8.4.3
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description: drbd - Distributed Replicated Block Device v8.4.3
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author: Philipp Reisner <phil@linbit.com>, Lars Ellenberg <lars@linbit.com>
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srcversion: 1A9F77B1CA5FF92235C2213
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depends: lru_cache,libcrc32c
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intree: Y
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vermagic: 3.16.0-4-amd64 SMP mod_unload modversions
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parm: minor_count:Approximate number of drbd devices (1-255) (uint)
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parm: disable_sendpage:bool
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parm: allow_oos:DONT USE! (bool)
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parm: proc_details:int
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parm: usermode_helper:string
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~~~
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@ -54,81 +67,14 @@ resource "vol0" {
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## Configuration d'une ressource en mode Primary/Primary
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La configuration entre 8.3 et supérieur est assez différente.
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### DRBD 8.3
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Fichier /etc/drbd.conf :
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~~~
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global { usage-count no; }
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common { syncer { rate 30M; }}
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resource r0 {
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protocol C;
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startup {
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wfc-timeout 15;
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degr-wfc-timeout 60;
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become-primary-on both;
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}
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net {
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cram-hmac-alg sha1;
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shared-secret "mon-secret";
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allow-two-primaries;
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after-sb-0pri discard-zero-changes;
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after-sb-1pri discard-secondary;
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after-sb-2pri disconnect;
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}
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on kvm1 {
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device /dev/drbd0;
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disk /dev/sda10;
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address 192.168.0.1:7788;
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meta-disk internal;
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}
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on kvm2 {
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device /dev/drbd0;
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disk /dev/sda10;
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address 192.168.0.2:7788;
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meta-disk internal;
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}
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}
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~~~
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Pour éviter les split-brain (incohérence des données), on peut demander à ce qu'un noeud qui n'a plus accès à son peer se "suicide" en ajoutant à la ressource la section :
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~~~
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handlers {
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pri-on-incon-degr "/usr/lib/drbd/notify-pri-on-incon-degr.sh; /usr/lib/drbd/notify-emergency-reboot.sh; echo b > /proc/sysrq-trigger ; reboot -f";
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pri-lost-after-sb "/usr/lib/drbd/notify-pri-lost-after-sb.sh; /usr/lib/drbd/notify-emergency-reboot.sh; echo b > /proc/sysrq-trigger ; reboot -f";
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local-io-error "/usr/lib/drbd/notify-io-error.sh; /usr/lib/drbd/notify-emergency-shutdown.sh; echo o > /proc/sysrq-trigger ; halt -f";
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}
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~~~
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A faire sur les deux machines :
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~~~
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# drbdadm create-md r0
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# drbdadm attach r0
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# drbdadm syncer r0
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# /etc/init.d/drbd start
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~~~
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A faire sur une machine, initialiser la synchronisation:
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~~~
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# drbdadm -- --overwrite-data-of-peer primary r0
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~~~
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### DRBD 8.9
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/etc/drbd.d/r0.res :
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`/etc/drbd.d/r0.res` :
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~~~
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resource r0 {
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net {
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protocol C;
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cram-hmac-alg "sha1";
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shared-secret "PASSPHRASE";
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shared-secret "PASSWORD";
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allow-two-primaries;
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}
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volume 0 {
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@ -145,7 +91,7 @@ resource r0 {
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}
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~~~
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Note : "tic" et "tac" doivent correspondre aux hostnames réels des machines concernées.
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*Note* : "tic" et "tac" doivent correspondre aux hostnames réels des machines concernées.
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Puis sur les 2 machines :
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@ -171,79 +117,9 @@ Et sur l'une des 2 machines :
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## Configuration d'une seconde ressource en mode Primary/Primary
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### DRDB 8.3
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On ajoute la section suivante dans /etc/drbd.conf
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~~~
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resource r1 {
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protocol C;
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startup {
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wfc-timeout 15;
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degr-wfc-timeout 60;
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become-primary-on both;
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}
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net {
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cram-hmac-alg sha1;
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shared-secret "mon-secret";
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allow-two-primaries;
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after-sb-0pri discard-zero-changes;
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after-sb-1pri discard-secondary;
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after-sb-2pri disconnect;
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}
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on kvm1 {
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device /dev/drbd1;
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disk /dev/sdb1;
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address 192.168.0.4:7790;
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meta-disk internal;
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}
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on kvm2 {
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device /dev/drbd1;
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disk /dev/sdb1;
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address 192.168.0.2:7790;
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meta-disk internal;
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}
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}
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~~~
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Une fois la configuration en place sur tous les serveurs :
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~~~
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# drbdadm create-md r1
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Writing meta data…
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initializing activity log
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NOT initialized bitmap
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New drbd meta data block successfully created.
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# /etc/init.d/drbd reload
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Reloading DRBD configuration:.
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~~~
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Sur l'un des 2 serveurs, on lance :
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~~~
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# drbdadm -- --overwrite-data-of-peer primary r1
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~~~
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Sur l'autre, la synchronisation va se faire, puis on passer en Primary/Primary :
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~~~
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# cat /proc/drbd
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version: 8.3.11 (api:88/proto:86-96)
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srcversion: F937DCB2E5D83C6CCE4A6C9
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0: cs:Connected ro:Primary/Primary ds:UpToDate/UpToDate C r-----
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ns:97409309 nr:497444091 dw:647985959 dr:195677677 al:59202927 bm:47198 lo:0 pe:0 ua:0 ap:0 ep:1 wo:f oos:0
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1: cs:SyncTarget ro:Secondary/Primary ds:Inconsistent/UpToDate C r-----
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ns:0 nr:2699520 dw:2699520 dr:0 al:0 bm:164 lo:1 pe:6 ua:0 ap:0 ep:1 wo:f oos:2144717528
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[>…] sync'ed: 0.2% (2094448/2097084)Mfinish: 6:20:25 speed: 93,956 (93,084) want: 92,160 K/sec
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# drbdadm primary r1
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~~~
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### DRDB 8.9
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On peut configurer plusieurs volumes par ressource.
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/etc/drbd.d/r0.res :
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`/etc/drbd.d/r0.res` :
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~~~
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resource r0 {
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@ -280,7 +156,7 @@ dans ce cas on dupliquera simplement la configuration d'une ressource en utilisa
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Il est nécessaire de disposer d'un FS clusterisé car le FS sera monté à deux endroits différents, ce qui n'est pas possible avec un FS standard tel que ext4.
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##### Installation
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### Installation
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~~~
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# aptitude install ocfs2-tools
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