Remarque<\/ins> : les actions suivantes sont \u00e0 r\u00e9aliser sur les deux noeuds.<\/p>\n\n\n\n Voici le disque d\u00e9di\u00e9 \u00e0 DRBD, sans partition :<\/p>\n\n\n\n Lancer l’outil de partitionnement de ce m\u00eame disque :<\/p>\n\n\n\n Une fois le partitionnement termin\u00e9, voici ce que nous obtenons :<\/p>\n\n\n\n Remarque<\/ins> : les actions suivantes sont \u00e0 r\u00e9aliser sur les deux noeuds. Installer DRBD :<\/p>\n\n\n\n Lancer le module appropri\u00e9 :<\/p>\n\n\n\n V\u00e9rifier la pr\u00e9sence du module :<\/p>\n\n\n\n Sauvegarder la configuration d’origine :<\/p>\n\n\n\n Configurer DRBD :<\/p>\n\n\n\n Initialiser le RAID avec la ressource r0 :<\/p>\n\n\n\n D\u00e9marrer le service DRBD :<\/p>\n\n\n\n Remarque <\/ins> : les actions suivantes sont \u00e0 r\u00e9aliser uniquement sur le premier noeud.<\/p>\n\n\n\n Forcer la r\u00e9plication des donn\u00e9es de la ressource r0 depuis le premier noeud :<\/p>\n\n\n\n V\u00e9rifier le status de la ressource r0 :<\/p>\n\n\n\n Cr\u00e9er le syst\u00e8me de fichiers sur le volume DRBD :<\/p>\n\n\n\n Cr\u00e9er le point de montage :<\/p>\n\n\n\n Exemple de configuration de Pacemaker :<\/p>\n\n\n\n Sur le noeud 1 :<\/p>\n\n\n\n Sur le noeud 2 :<\/p>\n\n\n\n Ce \u00e0 quoi cela correspond :<\/p>\n\n\n\n You suffer from schizophrenic DRBD, better known as “split brain”.<\/p>\n\n\n\n Basically it means that both nodes became primary on your test resource and started writing to it. The result is an inconsistent resource, which is then called “split brain”. Please read the documentation carefully, you will have to discard the data on one of your nodes and let drbd sync that node from scratch.<\/p>\n\n\n\n D\u00e9connecter le noeud avec les “mauvaises” donn\u00e9es :<\/p>\n\n\n\n Lancer la synchronisation depuis le noeud avec les “bonnes” donn\u00e9es :<\/p>\n\n\n\n Partitionnement Remarque : les actions suivantes sont \u00e0 r\u00e9aliser sur les deux noeuds. Voici le disque d\u00e9di\u00e9 \u00e0 DRBD, sans partition : # fdisk -l \/dev\/cciss\/c0d1 Disk \/dev\/cciss\/c0d1: 39.4 GB, 39406141440 bytes …<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[32,8,33,9,34],"class_list":["post-42","post","type-post","status-publish","format-standard","hentry","category-computing","tag-corosync","tag-debian","tag-drbd","tag-linux","tag-pacemaker"],"_links":{"self":[{"href":"https:\/\/www.n3oxid.fr\/index.php?rest_route=\/wp\/v2\/posts\/42","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.n3oxid.fr\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.n3oxid.fr\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.n3oxid.fr\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.n3oxid.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=42"}],"version-history":[{"count":1,"href":"https:\/\/www.n3oxid.fr\/index.php?rest_route=\/wp\/v2\/posts\/42\/revisions"}],"predecessor-version":[{"id":43,"href":"https:\/\/www.n3oxid.fr\/index.php?rest_route=\/wp\/v2\/posts\/42\/revisions\/43"}],"wp:attachment":[{"href":"https:\/\/www.n3oxid.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=42"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.n3oxid.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=42"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.n3oxid.fr\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=42"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}# fdisk -l \/dev\/cciss\/c0d1\n<\/pre>\n\n\n\n
Disk \/dev\/cciss\/c0d1: 39.4 GB, 39406141440 bytes\n255 heads, 32 sectors\/track, 9432 cylinders\nUnits = cylinders of 8160 * 512 = 4177920 bytes\nSector size (logical\/physical): 512 bytes \/ 512 bytes\nI\/O size (minimum\/optimal): 512 bytes \/ 512 bytes\nDisk identifier: 0x64476aa0\n\nDisk \/dev\/cciss\/c0d1 doesn't contain a valid partition table\n<\/pre>\n\n\n\n
# cfdisk \/dev\/cciss\/c0d1\n<\/pre>\n\n\n\n
# fdisk -l \/dev\/cciss\/c0d1\n<\/pre>\n\n\n\n
Disk \/dev\/cciss\/c0d1: 39.4 GB, 39406141440 bytes\n255 heads, 32 sectors\/track, 9432 cylinders\nUnits = cylinders of 8160 * 512 = 4177920 bytes\nSector size (logical\/physical): 512 bytes \/ 512 bytes\nI\/O size (minimum\/optimal): 512 bytes \/ 512 bytes\nDisk identifier: 0x64476aa0\n\n\nDevice Boot Start End Blocks Id System\n\/dev\/cciss\/c0d1p1 1 9432 38482544 83 Linux\n<\/pre>\n\n\n\n
DRBD ou le RAID 1 over TCP\/IP<\/h2>\n\n\n\n
# aptitude install drbd8-utils\n<\/pre>\n\n\n\n
# modprobe drbd\n<\/pre>\n\n\n\n
# lsmod | grep drbd\n<\/pre>\n\n\n\n
drbd 172668 0\nlru_cache 4018 1 drbd\ncn 3631 1 drbd\n<\/pre>\n\n\n\n
# cp \/etc\/drbd.conf \/etc\/drbd.conf.original\n<\/pre>\n\n\n\n
# > \/etc\/drbd.conf\n# vim \/etc\/drbd.conf\n<\/pre>\n\n\n\n
global { usage-count no; }\ncommon { syncer { rate 100M; } }\nresource r0 {\n protocol C;\n startup {\n wfc-timeout 15;\n degr-wfc-timeout 60;\n }\n net {\n cram-hmac-alg sha1;\n shared-secret \"***********\";\n }\n on vm-debian1 {\n device \/dev\/drbd0;\n disk \/dev\/cciss\/c0d1;\n address 10.20.30.1:7788;\n meta-disk internal;\n }\n on vm-debian2 {\n device \/dev\/drbd0;\n disk \/dev\/cciss\/c0d1;\n address 10.20.30.2:7788;\n meta-disk internal;\n }\n}\n<\/pre>\n\n\n\n# drbdadm create-md r0\n<\/pre>\n\n\n\n
md_offset 39406137344\nal_offset 39406104576\nbm_offset 39404900352\n\nFound some data\n\n ==> This might destroy existing data! <==\n\nDo you want to proceed?\n[need to type 'yes' to confirm] yes\n\nWriting meta data...\ninitializing activity log\nNOT initialized bitmap\nNew drbd meta data block successfully created.\n<\/pre>\n\n\n\n
# \/etc\/init.d\/drbd start\n<\/pre>\n\n\n\n
# drbdadm -- --overwrite-data-of-peer primary all\n<\/pre>\n\n\n\n
# cat \/proc\/drbd\n<\/pre>\n\n\n\n
# mkfs.ext3 \/dev\/drbd0\n<\/pre>\n\n\n\n
Int\u00e9gration de la ressource DRBD sous Pacemaker<\/h2>\n\n\n\n
# mkdir \/cluster\n<\/pre>\n\n\n\n
# crm configure show\n<\/pre>\n\n\n\n
node vm-debian1\nnode vm-debian2\nprimitive ClusterDisk ocf:linbit:drbd \\\n params drbd_resource=\"r0\" \\\n op monitor interval=\"15s\"\nprimitive ClusterFS ocf:heartbeat:Filesystem \\\n params device=\"\/dev\/drbd0\" directory=\"\/cluster\" fstype=\"ext3\"\nprimitive ClusterIP ocf:heartbeat:IPaddr2 \\\n params ip=\"10.20.30.10\" cidr_netmask=\"23\" \\\n op monitor interval=\"15\"\nprimitive Nagios lsb:nagios \\\n op monitor interval=\"15s\" timeout=\"20s\" \\\n meta target-role=\"Stopped\"\nms MasterSlaveDisk ClusterDisk \\\n meta master-max=\"1\" master-node-max=\"1\" clone-max=\"2\" clone-node-max=\"1\" notify=\"true\" target-role=\"Started\"\ncolocation Nagios-with-ClusterFS inf: Nagios ClusterFS\ncolocation mount-ClusterFS-on-Master inf: ClusterFS MasterSlaveDisk:Master\ncolocation mount-ClusterIP-with-ClusterFS inf: ClusterIP ClusterFS\norder Nagios-after-ClusterFS inf: ClusterFS Nagios\norder mount-ClusterFS-after-ClusterDisk inf: MasterSlaveDisk:promote ClusterFS:start\norder mount-ClusterIP-after-ClusterFS inf: ClusterFS ClusterIP\nproperty $id=\"cib-bootstrap-options\" \\\n dc-version=\"1.0.9-74392a28b7f31d7ddc86689598bd23114f58978b\" \\\n cluster-infrastructure=\"openais\" \\\n expected-quorum-votes=\"2\" \\\n stonith-enabled=\"false\" \\\n no-quorum-policy=\"ignore\" \\\n last-lrm-refresh=\"1334323679\"\nrsc_defaults $id=\"rsc-options\" \\\n resource-stickiness=\"100\"\n<\/pre>\n\n\n\n
Exemple d’un probl\u00e8me de synchronisation<\/h2>\n\n\n\n
# drbdadm status\n<\/pre>\n\n\n\n
<drbd-status version=\"8.3.7\" api=\"88\">\n<resources config_file=\"\/etc\/drbd.conf\">\n<resource minor=\"0\" name=\"r0\" cs=\"StandAlone\" ro1=\"Primary\" ro2=\"Unknown\" ds1=\"UpToDate\" ds2=\"DUnknown\" \/>\n<\/resources>\n<\/drbd-status>\n<\/pre>\n\n\n\n
# drbdadm status\n<\/pre>\n\n\n\n
<drbd-status version=\"8.3.7\" api=\"88\">\n<resources config_file=\"\/etc\/drbd.conf\">\n<resource minor=\"0\" name=\"r0\" cs=\"StandAlone\" ro1=\"Secondary\" ro2=\"Unknown\" ds1=\"Outdated\" ds2=\"DUnknown\" \/>\n<\/resources>\n<\/drbd-status>\n<\/pre>\n\n\n\n
# drbdadm -- --discard-my-data connect all\n<\/pre>\n\n\n\n
# drbdadm connect all<\/pre>\n","protected":false},"excerpt":{"rendered":"