IT17462: RHEL 7: THE DB2 FAULT MONITOR FEATURE DOES NOT SUPPORT THE SYSTEMD INIT SYSTEM

DB2 Version 11.1 Mod1 Fix Pack1 iFix001 for Linux, UNIX, and Windows
DB2 Version 11.1 Mod 2 Fix Pack 2 for Linux, UNIX, and Windows
Db2 Version 11.1 Mod2 Fix Pack2 iFix001 for Linux, UNIX, and Windows
Db2 Version 11.1 Mod2 Fix Pack2 iFix002 for Linux, UNIX, and Windows
Db2 Version 11.1 Mod 3 Fix Pack 3 for Linux, UNIX, and Windows
Db2 Version 11.1 Mod3 Fix Pack3 iFix001 for Linux, UNIX, and Windows
Db2 Version 11.1 Mod3 Fix Pack3 iFix002 for Linux, UNIX, and Windows
Db2 Version 11.1 Mod4 Fix Pack4 iFix001 for Linux, UNIX, and Windows

APAR status

• Closed as new function.

Error description

• In Red Hat Enterprise Linux 7, systemd replaces upstart as the
  default init system. The DB2 fault monitor does not support the
  systemd init system. During execution of db2fmcu, instead of
  expected systemd configuration, db2fmcu creates an entry in the
  deprecated /etc/inittab file.
  
  You can observe symptoms in OS strace. Once you execute:
  
  ./db2fmcu -u -p /opt/ibm/db2/V11.1/bin/db2fmcd
  
  In the trace snippet you can see:
  
  readlink("/etc/inittab", 0x7ffff54f82e0, 4094) = -1 EINVAL
  (Invalid argument)
  access("/etc/.inittab.lock", F_OK) = 0
  open("/etc/.inittab.lock", O_WRONLY|O_CREAT, 0644) = 3
  fcntl(3, F_SETLKW, {type=F_WRLCK, whence=SEEK_SET, start=0,
  len=0}) = 0
  readlink("/etc/inittab", 0x7ffff54f8190, 4094) = -1 EINVAL
  (Invalid argument)
  access("/etc/inittab", F_OK) = 0
  ...
  
  The goal of this APAR is to introduce support for systemd by the
  DB2 fault monitor.
  

Local fix

• Create file: /etc/systemd/system/db2fmcd.service with following
  content:
  
  [Unit]
  Description=DB2V111
  
  [Service]
  ExecStart=/opt/ibm/db2/V11.1/bin/db2fmcd
  Restart=always
  KillMode=process
  KillSignal=SIGHUP
  
  [Install]
  WantedBy=default.target
  
  
  Next execute:
  
  systemctl enable db2fmcd
  systemctl start db2fmcd
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * Db2 RHEL 7 users                                             *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * See Error Description                                        *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * Upgrade to Db2 V11.1 Mod 1 Fix Pack 1                        *
  ****************************************************************
  

Problem conclusion

• Fixed in Db2 V11.1 Mod 1 Fix Pack 1
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

  IT06863

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  DB2 FOR LUW

• Fixed component ID

  DB2FORLUW

Applicable component levels