Log files

Contents

Overview

The operator can automatically override WebLogic Server, domain, and introspector .log and .out locations. This occurs if the Domain logHomeEnabled field is explicitly set to true, or if logHomeEnabled isn’t set and domainHomeSourceType is set to PersistentVolume. When overriding, the log location will be the location specified by the logHome setting.

WebLogic Server .out files contain a subset of WebLogic Server .log files. The operator, by default, echoes these .out files to each server pod log. To disable this behavior, set the Domain includeServerOutInPodLog to false.

Optionally, you can monitor a WebLogic Server and its log using an Elastic Stack (previously referred to as the ELK Stack, after Elasticsearch, Logstash, and Kibana). For an example, see the WebLogic Server Elastic Stack sample.

Kubernetes stores pod logs on each of its nodes, and, depending on the Kubernetes implementation, extra steps may be necessary to limit their disk space usage. For more information, see Kubernetes Logging Architecture.

WebLogic Server log file location

When logHomeEnabled is false, WebLogic Server log files are placed in a subdirectory <domain.spec.domainHome>/servers/<server name>/logs.

When logHomeEnabled is true, WebLogic Server log files are placed in a subdirectory <domain.spec.logHome>/servers/<server name>/logs by default, or alternatively placed in subdirectory <domain.spec.logHome> when logHomeLayout is set to Flat.

For example, here is the default layout of the log files under the logHome root:

/shared/logs/domain1$ ls -aRtl
-rw-r----- 1 docker root 291340 Apr 27 10:26 sample-domain1.log
-rw-r--r-- 1 docker root  24772 Apr 26 12:50 introspector_script.out
drwxr-xr-x 1 docker root    108 Apr 25 13:49 servers

./servers/managed-server2/logs:
-rw-r----- 1 docker root 921385 Apr 27 18:20 managed-server2.log
-rw-r----- 1 docker root  25421 Apr 27 10:26 managed-server2.out
-rw-r----- 1 docker root  14711 Apr 27 10:25 managed-server2_nodemanager.log
-rw-r--r-- 1 docker root  16829 Apr 27 10:25 managed-server2_nodemanager.out
-rw-r----- 1 docker root      5 Apr 27 10:25 managed-server2.pid

./servers/admin-server/logs:
-rw-r----- 1 docker root 903878 Apr 27 18:19 admin-server.log
-rw-r----- 1 docker root  16516 Apr 27 10:25 admin-server_nodemanager.log
-rw-r--r-- 1 docker root  18610 Apr 27 10:25 admin-server_nodemanager.out
-rw-r----- 1 docker root  25514 Apr 27 10:25 admin-server.out
-rw-r----- 1 docker root      5 Apr 27 10:25 admin-server.pid

WebLogic Server log file rotation and size

If you want to fine tune the .log and .out rotation behavior for WebLogic Servers and domains, then you can update the related Log MBean in your WebLogic configuration. Alternatively, for WebLogic Servers, you can set corresponding system properties in JAVA_OPTIONS:

  • Here are some WLST offline examples for creating and accessing commonly tuned Log MBeans:

    # domain log
cd('/')
create(dname,'Log')
cd('/Log/' + dname);

# configured server log for a server named 'sname'
cd('/Servers/' + sname)
create(sname, 'Log')
cd('/Servers/' + sname + '/Log/' + sname)

# templated (dynamic) server log for a template named 'tname'
cd('/ServerTemplates/' + tname)
create(tname,'Log')
cd('/ServerTemplates/' + tname + '/Log/' + tname)

  • Here is sample WLST offline code for commonly tuned Log MBean attributes:

    # minimum log file size before rotation in kilobytes
set('FileMinSize', 1000)

# maximum number of rotated files
set('FileCount', 10)

# set to true to rotate file every time on startup (instead of append)
set('RotateLogOnStartup', 'true')

  • Here are the defaults for commonly tuned Log MBean attributes:

    Log MBean Attribute Production Mode Default Development Mode Default
    FileMinSize (in kilobytes) 5000 500
    FileCount 100 7
    RotateLogOnStartup false true

  • For WebLogic Server .log and .out files (including both dynamic and configured servers), you can alternatively set logging attributes using system properties that start with weblogic.log. and that end with the corresponding Log MBean attribute name.

    For example, you can include -Dweblogic.log.FileMinSize=1000 -Dweblogic.log.FileCount=10 -Dweblogic.log.RotateLogOnStartup=true in domain.spec.serverPod.env.name.JAVA_OPTIONS to set the behavior for all WebLogic Servers in your domain. For information about setting JAVA_OPTIONS, see Domain resource.