{"id":35384,"date":"2019-01-09T15:06:04","date_gmt":"2019-01-09T22:06:04","guid":{"rendered":"https:\/\/virtual-dba.com\/?p=35384"},"modified":"2023-08-11T09:52:19","modified_gmt":"2023-08-11T16:52:19","slug":"hard-coding-ports-for-hadr-multiple-standbys","status":"publish","type":"post","link":"https:\/\/virtual-dba.com\/blog\/hard-coding-ports-for-hadr-multiple-standbys\/","title":{"rendered":"Hard-Coding Ports for HADR When Setting up Multiple Standbys"},"content":{"rendered":"

While implementing HADR for multiple standbys, there could be potential issues if the HADR ports are not hard-coded on the HADR settings. Here’s what the issue looks like:<\/p>\n

The primary is dbpp.example.com<\/a>
\nThe standbys are:
\n1st – dbps.example.com
\n2nd \u2013 dbpa-east.example.com<\/p>\n

Customer was trying to add dbpa-east.example.com<\/a> as a second standby. Primary, dbpp.example.com<\/a>, complains like so:<\/p>\n

2018-01-03-09.24.43.032460-480 E283856652E553 LEVEL: Error (OS)
\nPID : 26091 TID : 46961361151744 PROC : db2sysc 0
\nINSTANCE: db2inst1 NODE : 000 DB : SAMPLE
\nHOSTNAME: dbpp.example.com<\/a>
\nEDUID : 1586 EDUNAME: db2hadrp.0.2 (SAMPLE) 0
\nFUNCTION: Db2 UDB, oper system services, sqloPdbQuerySocketErrorStatus, probe:15
\nMESSAGE : ZRC=0x810F0077=-2129723273=SQLO_COMM_ERR_EHOSTUNREACH
\n\"No route to host\"
\nCALLED : OS, -, getsockopt OSERR: EHOSTUNREACH (113)<\/code><\/p>\n

2018-01-03-09.24.55.001353-480 I283857206E468 LEVEL: Warning
\nPID : 26091 TID : 46961365346048 PROC : db2sysc 0
\nINSTANCE: db2inst1 NODE : 000 DB : SAMPLE
\nHOSTNAME: dbpp.example.com<\/a>
\nEDUID : 1585 EDUNAME: db2hadrp.0.1 (SAMPLE) 0
\nFUNCTION: Db2 UDB, High Availability Disaster Recovery, hdrHandleRemoteConn, probe:30160
\nMESSAGE : TCP socket connection accepted. Remote Host: X.X.XX.XX Port: 26324<\/code><\/p>\n

2018-01-03-09.24.55.102096-480 I283857675E508 LEVEL: Info
\nPID : 26091 TID : 46961365346048 PROC : db2sysc 0
\nINSTANCE: db2inst1 NODE : 000 DB : SAMPLE
\nHOSTNAME: dbpp.example.com<\/a>
\nEDUID : 1585 EDUNAME: db2hadrp.0.1 (SAMPLE) 0
\nFUNCTION: Db2 UDB, High Availability Disaster Recovery, hdrHandleHsAck, probe:43900
\nDATA #1 : <preformatted>
\nHandshake HDR_MSG_HDRHS message is received from dbp-east.example.com:db2_hadra (X.X.XX.XX:50052<\/a>)<\/code><\/p>\n

2018-01-03-09.24.55.103951-480 E283858960E555 LEVEL: Error
\nPID : 26091 TID : 46961365346048 PROC : db2sysc 0
\nINSTANCE: db2inst1 NODE : 000 DB : SAMPLE
\nHOSTNAME: dbpp.example.com<\/a>
\nEDUID : 1585 EDUNAME: db2hadrp.0.1 (SAMPLE) 0
\nFUNCTION: Db2 UDB, High Availability Disaster Recovery, hdrHandleHsAck, probe:30420
\nMESSAGE : ADM12513E Unable to establish HADR primary-standby connection
\nbecause the primary and standby databases are incompatible. Reason
\ncode: \"4\"<\/code><\/p>\n

2018-01-03-09.24.55.106072-480 I283859516E669 LEVEL: Warning
\nPID : 26091 TID : 46961365346048 PROC : db2sysc 0
\nINSTANCE: db2inst1 NODE : 000 DB : SAMPLE
\nHOSTNAME: dbpp.example.com<\/a>
\nEDUID : 1585 EDUNAME: db2hadrp.0.1 (SAMPLE) 0
\nFUNCTION: Db2 UDB, High Availability Disaster Recovery, hdrSendRejectionIfNeeded, probe:30490
\nMESSAGE : ZRC=0x8280001A=-2105540582=HDR_ZRC_NO_STANDBY
\n\"Comm time-out in unforced HADR primary start, to avoid split-brain\"
\nDATA #1 : <preformatted>
\nA rejection message sent to HADR_LOCAL_HOST:HADR_LOCAL_SVC is dbp-east.example.com:db2_hadra (X.X.XX.XX:50052<\/a>)<\/code><\/p>\n

The second standby, dbp-east.example.com<\/a>, reports the above failure to establish HADR:<\/p>\n

2018-01-03-09.24.55.121626-480 I121560940E513 LEVEL: Info
\nPID : 19286 TID : 139664841238272 PROC : db2sysc 0
\nINSTANCE: db2inst1 NODE : 000 DB : SAMPLE
\nHOSTNAME: dbp-east.example.com<\/a>
\nEDUID : 934 EDUNAME: db2hadrs.0.0 (SAMPLE) 0
\nFUNCTION: Db2 UDB, High Availability Disaster Recovery, hdrHandleHsAck, probe:43900
\nDATA #1 : <preformatted>
\nHandshake HDR_MSG_HDRREJECT message is received from dbpp.example.com:db2_hadrs (X.X.X.X:50051)<\/code><\/p>\n

2018-01-03-09.24.55.121946-480 I121561454E631 LEVEL: Error
\nPID : 19286 TID : 139664841238272 PROC : db2sysc 0
\nINSTANCE: db2inst1 NODE : 000 DB : SAMPLE
\nHOSTNAME: dbp-east.example.com<\/a>
\nEDUID : 934 EDUNAME: db2hadrs.0.0 (SAMPLE) 0
\nFUNCTION: Db2 UDB, High Availability Disaster Recovery, hdrHandleHsAck, probe:43901
\nMESSAGE : ZRC=0x87800140=-2021654208=HDR_ZRC_CONFIGURATION_ERROR
\n\"One or both databases of the HADR pair is configured incorrectly\"
\nDATA #1 : <preformatted>
\nHADR handshake with dbpp.example.com:db2_hadrs (X.X.X.X:50051) failed.<\/code><\/p>\n

2018-01-03-09.24.55.123167-480 I121563753E528 LEVEL: Error
\nPID : 19286 TID : 139664841238272 PROC : db2sysc 0
\nINSTANCE: db2inst1 NODE : 000 DB : SAMPLE
\nHOSTNAME: dbp-east.example.com<\/a>
\nEDUID : 934 EDUNAME: db2hadrs.0.0 (SAMPLE) 0
\nFUNCTION: Db2 UDB, High Availability Disaster Recovery, hdrEdu::hdrEduS, probe:21480
\nMESSAGE : ZRC=0x87800140=-2021654208=HDR_ZRC_CONFIGURATION_ERROR
\n\"One or both databases of the HADR pair is configured incorrectly\"<\/code><\/p>\n

There was a service\/port difference in the handshake above:<\/p>\n

\"MESSAGE : TCP socket connection accepted. Remote Host: X.X.XX.XX Port: 26324\"<\/code><\/p>\n

vs.<\/p>\n

\"Handshake HDR_MSG_HDRHS message is received from dbp-east.example.com:db2_hadra (X.X.XX.XX:50052<\/a>)\"<\/code><\/p>\n

Notice the rejection was sent to X.X.XX.XX:50052<\/a>. This was because port 26324 came in first, but is not defined on the primary server, dbpp.example.com<\/a>, or the intended 2nd standby server, dbp-east.example.com<\/a>. This is what all three hosts \/etc\/services look like for the HADR service:<\/p>\n

db2_hadrp 50050\/tcp
\ndb2_hadrp 50050\/udp
\ndb2_hadrs 50051\/tcp
\ndb2_hadrs 50051\/udp
\ndb2_hadra 50052\/tcp
\ndb2_hadra 50052\/udp<\/code><\/p>\n

Where is port 26324 coming from? The work-around to this problem was hard-coding the port numbers instead of using the service names (db2_hadrp\/db2_hadrs\/db2_hadra) in the db cfg across all three hosts.<\/p>\n","protected":false},"excerpt":{"rendered":"

While implementing HADR for multiple standbys, there could be potential issues if the HADR ports are not hard-coded on the HADR settings. Here’s what the issue looks like: The primary is dbpp.example.com The standbys are: 1st – dbps.example.com 2nd \u2013 dbpa-east.example.com Customer was trying to add dbpa-east.example.com as a second standby. Primary, dbpp.example.com, complains like […]<\/p>\n","protected":false},"author":3,"featured_media":35395,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","content-type":"","footnotes":""},"categories":[4166,17],"tags":[3930,3931],"class_list":["post-35384","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","category-db2","tag-hadr","tag-multiple-standbys"],"yoast_head":"\nHard-Coding Ports for HADR When Setting up Multiple Standbys - Virtual-DBA Remote DBA Services & Support - Certified Database Experts<\/title>\n<meta name=\"description\" content=\"Resolve HADR multi-standby issues by hard-coding port settings. Avoid compatibility errors between primary and standbys. Learn more.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/virtual-dba.com\/blog\/hard-coding-ports-for-hadr-multiple-standbys\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Hard-Coding Ports for HADR When Setting up Multiple Standbys\" \/>\n<meta property=\"og:description\" content=\"Resolve HADR multi-standby issues by hard-coding port settings. Avoid compatibility errors between primary and standbys. 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