Oracle Enterprise Manager
login as user oracle
# su - oracle
$ emctl start dbconsole
after completed, then url of OEM is appeared. https://my-hostname:1158/em
but, when i open via browser, i got error message :
503 service unavailable,
"The Em Key could not be configured. The Em Key was not found in Management Repository."
so, simple way to solve this problem is : recreate Oracle Enterprise Manager
$ emca -deconfig dbcontrol db -repos drop
$ emca -config dbcontrol db -repos create
login as user oracle
# su - oracle
$ emctl start dbconsole
after completed, then url of OEM is appeared. https://my-hostname:1158/em
but, when i open via browser, i got error message :
503 service unavailable,
"The Em Key could not be configured. The Em Key was not found in Management Repository."
so, simple way to solve this problem is : recreate Oracle Enterprise Manager
$ emca -deconfig dbcontrol db -repos drop
$ emca -config dbcontrol db -repos create
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