GitHub user GerorgeEG created a discussion: Post ACS upgrade getting error
"Unable to load db configuration".
### problem
We have upgrade the ACS from 4.19.1.2 to 4.20.2.0 and after that Apache
CloudStack is giving "HTTP ERROR 503 Service Unavailable"
We verified ACS database is up but ACS management server is not able to connect
to database. Below is the error
`
WARN [c.c.u.d.T.Transaction] (main:[]) (logid:) Unable to load db
configuration, using defaults with 5 connections. Falling back on assumed
datasource on localhost:3306 using username:password=cloud:cloud. Please check
your configuration
com.zaxxer.hikari.pool.HikariPool$PoolInitializationException: Failed to
initialize pool: Could not create connection to database server. Attempted
reconnect 3 times. Giving up.
`
`me:password=cloud:cloud. Please check your configuration
com.zaxxer.hikari.pool.HikariPool$PoolInitializationException: Failed to
initialize pool: Could not create connection to database server. Attempted
reconnect 3 times. Giving up.
at
com.zaxxer.hikari.pool.HikariPool.throwPoolInitializationException(HikariPool.java:584)
2026-04-16 02:30:50,423 ERROR [c.c.u.d.Merovingian2] (main:[]) (logid:) Unable
to get a new db connection java.sql.SQLTransientConnectionException: cloud -
Connection is not available, request timed out after 1000ms (total=0, active=0,
idle=0, waiting=0)
The last packet sent successfully to the server was 0 milliseconds ago. The
driver has not received any packets from the server.
at
jdk.internal.reflect.GeneratedConstructorAccessor31.newInstance(Unknown Source)
at
java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at
java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:500)
at
java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:481)
at
com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:62)
at
com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:105)
at
com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:150)
at
com.mysql.cj.exceptions.ExceptionFactory.createCommunicationsException(ExceptionFactory.java:166)
at
com.mysql.cj.protocol.a.NativeSocketConnection.connect(NativeSocketConnection.java:89)
at com.mysql.cj.NativeSession.connect(NativeSession.java:121)
at
com.mysql.cj.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:945)
at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:815)
... 13 more
Caused by: java.net.ConnectException: Connection refused
at
com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:105)
at
com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:150)
at
com.mysql.cj.exceptions.ExceptionFactory.createCommunicationsException(ExceptionFactory.java:166)
at
com.mysql.cj.protocol.a.NativeSocketConnection.connect(NativeSocketConnection.java:89)
at com.mysql.cj.NativeSession.connect(NativeSession.java:121)
at
com.mysql.cj.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:945)
at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:815)
... 13 more
Caused by: java.net.ConnectException: Connection refused
`
### versions
ACS Version pre-upgrade : 4.19.1.2
ACS version post-upgrade : 4.20.2.0
Management and DB OS : RHEL 8
DB : MariaDB Galera Cluster
We have been able to upgrade other 3 environment installed with same
configuration but this upgrade is getting failed
### The steps to reproduce the bug
1.
2.
3.
...
### What to do about it?
_No response_
GitHub link: https://github.com/apache/cloudstack/discussions/13040
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