Hi, thanks, that got me a little closer I think, but not there yet. I looked
closer at docker networking. The setup guide tells you to create a guac
network for guacd and guacamole…so I did:
a0208821ff67 guac-network bridge local
ip addr:
6: br-a0208821ff67: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue
state UP group default
link/ether 7e:30:87:f8:f7:95 brd ff:ff:ff:ff:ff:ff
inet 172.18.0.1/16 brd 172.18.255.255 scope global br-a0208821ff67
valid_lft forever preferred_lft forever
inet6 fe80::7c30:87ff:fef8:f795/64 scope link
valid_lft forever preferred_lft forever
also, I can now ping
172.18.0.2 (guacd)
172.18.0.3 (guacamole)
I also added a bind statement to /etc/my.cnf.d/mariadb-server.conf:
bind-address=0.0.0.0
so netstat shows:
tcp 0 0 0.0.0.0:3306 0.0.0.0:* LISTEN
i am now starting the container this way:
docker run --network=guac-network --name lnb-guacamole -e
MYSQL_HOSTNAME="172.18.0.1" -e MYSQL_DATABASE="guacamole_db" -e
MYSQL_USERNAME="guacamole_user" -e MYSQL_SSL_MODE="disabled" -e
MYSQL_SERVER_TIMEZONE="America/New_York" -e LOGBACK_LEVEL="info" -e
MYSQL_DRIVER="mariadb" -e MYSQL_PASSWORD="somepw" -e GUACD_HOSTNAME="lnb-guacd"
-d -p 8080:8080 guacamole/guacamole
ug, but still same
11:06:42.230 [http-nio-8080-exec-10] ERROR o.a.g.rest.RESTExceptionMapper -
Unexpected internal error:
### Error querying database. Cause: java.sql.SQLException: Error setting
driver on UnpooledDataSource.
### The error may exist in org/apache/guacamole/auth/jdbc/user/UserMapper.xml
### The error may involve
org.apache.guacamole.auth.jdbc.user.UserMapper.selectOne
### The error occurred while executing a query
### Cause: java.sql.SQLException: Error setting driver on UnpooledDataSource.
Any other suggestions would be greatly appreciated
Tony Guadagno
Lyons National Bank
E: [email protected]
O: 585.577.1003
C: 585.703.6700
[cid:[email protected]]
From: Mailing Lists <[email protected]>
Sent: Friday, October 10, 2025 7:28 PM
To: [email protected]
Subject: Re: [External] Warning EXTERNAL Email help with new installation not
talking to native mariadb
Hi ,
just a quick hint.
I think „localhost“ from within docker is not your rhel9 host. so the container
can not find your database server.
you must find a way, either via real ip, docker bridge ip or real hostname to
get a route to your rhel9 server from the inside of the container.
via Smartphone
Am 10.10.2025 um 23:19 schrieb Tony Guadagno
<[email protected]<mailto:[email protected]>>:
Hi, I am new to guac and am moving through the online guides. I am using guacd
and guacamole docker containers but I am using native mariadb all on a single
rhel 9 server. I have gone through the process of creating the database and
user in maria. I have run the initialization script and I can see that it did
create the tables so all looks good there. I am now trying to go to the login
page. Before I set the database parms up, I got a login page but I could not
login (expected) after I configured the database info, I get an error page on
guac. I am starting the container this way:
docker run --name lnb-guacamole -e MYSQL_HOSTNAME="localhost" -e
MYSQL_DATABASE="guacamole_db" -e MYSQL_USERNAME="guacamole_user" -e
MYSQL_SSL_MODE="disabled" -e MYSQL_SERVER_TIMEZONE="America/New_York" -e
MYSQL_DRIVER="mariadb" -e MYSQL_PASSWORD="somepw" -e GUACD_HOSTNAME="lnb-guacd"
-d -p 8080:8080 guacamole/guacamole
This is in the logs:
I would appreciate any help…thanks
[root@lnb-rdp bin]# docker logs lnb-guacamole
NOTE: Picked up JDK_JAVA_OPTIONS: --add-opens=java.base/java.lang=ALL-UNNAMED
--add-opens=java.base/java.lang.invoke=ALL-UNNAMED
--add-opens=java.base/java.lang.reflect=ALL-UNNAMED
--add-opens=java.base/java.io=ALL-UNNAMED
--add-opens=java.base/java.util=ALL-UNNAMED
--add-opens=java.base/java.util.concurrent=ALL-UNNAMED
--add-opens=java.rmi/sun.rmi.transport=ALL-UNNAMED
10-Oct-2025 21:00:46.652 INFO [main]
org.apache.catalina.startup.VersionLoggerListener.log Server version name:
Apache Tomcat/9.0.110
10-Oct-2025 21:00:46.655 INFO [main]
org.apache.catalina.startup.VersionLoggerListener.log Server built:
Oct 1 2025 08:36:05 UTC
10-Oct-2025 21:00:46.656 INFO [main]
org.apache.catalina.startup.VersionLoggerListener.log Server version number:
9.0.110.0
10-Oct-2025 21:00:46.656 INFO [main]
org.apache.catalina.startup.VersionLoggerListener.log OS Name:
Linux
10-Oct-2025 21:00:46.656 INFO [main]
org.apache.catalina.startup.VersionLoggerListener.log OS Version:
5.14.0-570.51.1.el9_6.x86_64
10-Oct-2025 21:00:46.656 INFO [main]
org.apache.catalina.startup.VersionLoggerListener.log Architecture:
amd64
10-Oct-2025 21:00:46.656 INFO [main]
org.apache.catalina.startup.VersionLoggerListener.log Java Home:
/opt/java/openjdk
10-Oct-2025 21:00:46.657 INFO [main]
org.apache.catalina.startup.VersionLoggerListener.log JVM Version:
21.0.8+9-LTS
10-Oct-2025 21:00:46.657 INFO [main]
org.apache.catalina.startup.VersionLoggerListener.log JVM Vendor:
Eclipse Adoptium
10-Oct-2025 21:00:46.658 INFO [main]
org.apache.catalina.startup.VersionLoggerListener.log CATALINA_BASE:
/tmp/catalina-base.f4H5RUfMwL
10-Oct-2025 21:00:46.658 INFO [main]
org.apache.catalina.startup.VersionLoggerListener.log CATALINA_HOME:
/usr/local/tomcat
10-Oct-2025 21:00:46.665 INFO [main]
org.apache.catalina.startup.VersionLoggerListener.log Command line argument:
--add-opens=java.base/java.lang=ALL-UNNAMED
10-Oct-2025 21:00:46.666 INFO [main]
org.apache.catalina.startup.VersionLoggerListener.log Command line argument:
--add-opens=java.base/java.lang.invoke=ALL-UNNAMED
10-Oct-2025 21:00:46.666 INFO [main]
org.apache.catalina.startup.VersionLoggerListener.log Command line argument:
--add-opens=java.base/java.lang.reflect=ALL-UNNAMED
10-Oct-2025 21:00:46.666 INFO [main]
org.apache.catalina.startup.VersionLoggerListener.log Command line argument:
--add-opens=java.base/java.io=ALL-UNNAMED
10-Oct-2025 21:00:46.667 INFO [main]
org.apache.catalina.startup.VersionLoggerListener.log Command line argument:
--add-opens=java.base/java.util=ALL-UNNAMED
10-Oct-2025 21:00:46.667 INFO [main]
org.apache.catalina.startup.VersionLoggerListener.log Command line argument:
--add-opens=java.base/java.util.concurrent=ALL-UNNAMED
10-Oct-2025 21:00:46.667 INFO [main]
org.apache.catalina.startup.VersionLoggerListener.log Command line argument:
--add-opens=java.rmi/sun.rmi.transport=ALL-UNNAMED
10-Oct-2025 21:00:46.667 INFO [main]
org.apache.catalina.startup.VersionLoggerListener.log Command line argument:
-Djava.util.logging.config.file=/tmp/catalina-base.f4H5RUfMwL/conf/logging.properties
10-Oct-2025 21:00:46.668 INFO [main]
org.apache.catalina.startup.VersionLoggerListener.log Command line argument:
-Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
10-Oct-2025 21:00:46.668 INFO [main]
org.apache.catalina.startup.VersionLoggerListener.log Command line argument:
-Djdk.tls.ephemeralDHKeySize=2048
10-Oct-2025 21:00:46.668 INFO [main]
org.apache.catalina.startup.VersionLoggerListener.log Command line argument:
-Djava.protocol.handler.pkgs=org.apache.catalina.webresources
10-Oct-2025 21:00:46.668 INFO [main]
org.apache.catalina.startup.VersionLoggerListener.log Command line argument:
-Dsun.io.useCanonCaches=false
10-Oct-2025 21:00:46.669 INFO [main]
org.apache.catalina.startup.VersionLoggerListener.log Command line argument:
-Dorg.apache.catalina.security.SecurityListener.UMASK=0027
10-Oct-2025 21:00:46.669 INFO [main]
org.apache.catalina.startup.VersionLoggerListener.log Command line argument:
-Dignore.endorsed.dirs=
10-Oct-2025 21:00:46.669 INFO [main]
org.apache.catalina.startup.VersionLoggerListener.log Command line argument:
-Dcatalina.base=/tmp/catalina-base.f4H5RUfMwL
10-Oct-2025 21:00:46.669 INFO [main]
org.apache.catalina.startup.VersionLoggerListener.log Command line argument:
-Dcatalina.home=/usr/local/tomcat
10-Oct-2025 21:00:46.669 INFO [main]
org.apache.catalina.startup.VersionLoggerListener.log Command line argument:
-Djava.io.tmpdir=/tmp/catalina-base.f4H5RUfMwL/temp
10-Oct-2025 21:00:46.672 INFO [main]
org.apache.catalina.core.AprLifecycleListener.lifecycleEvent Loaded Apache
Tomcat Native library [1.3.1] using APR version [1.7.2].
10-Oct-2025 21:00:46.672 INFO [main]
org.apache.catalina.core.AprLifecycleListener.lifecycleEvent APR capabilities:
IPv6 [true], sendfile [true], accept filters [false], random [true], UDS [true].
10-Oct-2025 21:00:46.673 INFO [main]
org.apache.catalina.core.AprLifecycleListener.lifecycleEvent APR/OpenSSL
configuration: useAprConnector [false], useOpenSSL [true]
10-Oct-2025 21:00:46.675 INFO [main]
org.apache.catalina.core.AprLifecycleListener.initializeSSL OpenSSL
successfully initialized [OpenSSL 3.0.13 30 Jan 2024]
10-Oct-2025 21:00:46.968 INFO [main] org.apache.coyote.AbstractProtocol.init
Initializing ProtocolHandler ["http-nio-8080"]
10-Oct-2025 21:00:46.984 INFO [main] org.apache.catalina.startup.Catalina.load
Server initialization in [479] milliseconds
10-Oct-2025 21:00:47.009 INFO [main]
org.apache.catalina.core.StandardService.startInternal Starting service
[Catalina]
10-Oct-2025 21:00:47.010 INFO [main]
org.apache.catalina.core.StandardEngine.startInternal Starting Servlet engine:
[Apache Tomcat/9.0.110]
10-Oct-2025 21:00:47.021 INFO [main]
org.apache.catalina.startup.HostConfig.deployWAR Deploying web application
archive [/tmp/catalina-base.f4H5RUfMwL/webapps/guacamole.war]
10-Oct-2025 21:00:48.611 INFO [main]
org.apache.jasper.servlet.TldScanner.scanJars At least one JAR was scanned for
TLDs yet contained no TLDs. Enable debug logging for this logger for a complete
list of JARs that were scanned but no TLDs were found in them. Skipping
unneeded JARs during scanning can improve startup time and JSP compilation time.
21:00:48.793 [main] INFO org.apache.guacamole.environment.LocalEnvironment --
GUACAMOLE_HOME is "/tmp/guacamole-home.5It2BfNxkb".
21:00:48.853 [main] INFO org.apache.guacamole.GuacamoleServletContextListener
-- Read configuration parameters from
"/tmp/guacamole-home.5It2BfNxkb/guacamole.properties".
21:00:48.855 [main] INFO org.apache.guacamole.GuacamoleServletContextListener
-- Additional configuration parameters may be read from environment variables.
21:00:48.856 [main] INFO org.apache.guacamole.GuacamoleServletContextListener
-- Additional configuration parameters may be read from files pointed to by
"*_FILE" environment variables.
21:00:48.857 [main] INFO org.apache.guacamole.rest.auth.HashTokenSessionMap --
Sessions will expire after 60 minutes of inactivity.
21:00:48.922 [main] INFO org.apache.guacamole.log.LogModule -- Logging will be
at the "info" level.
21:00:49.172 [main] INFO o.a.g.extension.ExtensionModule - Multiple extensions
are installed and will be loaded in order of decreasing priority:
21:00:49.173 [main] INFO o.a.g.extension.ExtensionModule - - [ban]
"Brute-force Authentication Detection/Prevention"
(/tmp/guacamole-home.5It2BfNxkb/extensions/guacamole-auth-ban.jar)
21:00:49.173 [main] INFO o.a.g.extension.ExtensionModule - - [mysql] "MySQL
Authentication"
(/tmp/guacamole-home.5It2BfNxkb/extensions/guacamole-auth-jdbc-mysql.jar)
21:00:49.173 [main] INFO o.a.g.extension.ExtensionModule - To change this
order, set the "extension-priority" property or rename the extension files. The
default priority of extensions is dictated by the sort order of their filenames.
21:00:49.192 [main] INFO o.a.g.a.b.BanningAuthenticationListener - Addresses
will be automatically banned for 300 seconds after 5 failed authentication
attempts. Up to 10485760 unique addresses will be tracked/banned at any given
time.
21:00:49.223 [main] INFO o.a.g.extension.ExtensionModule - Extension
"Brute-force Authentication Detection/Prevention" (ban) loaded.
21:00:49.232 [main] WARN o.a.g.a.m.MySQLAuthenticationProviderModule - The
MySQL module is currently configured to support case-sensitive username and/or
group name comparisons, however, the default collations for MySQL databases do
not support case-sensitive string comparisons. If you want identifiers within
Guacamole to be treated as case-sensitive, further database configuration may
be required.
21:00:49.816 [main] INFO o.a.g.extension.ExtensionModule - Extension "MySQL
Authentication" (mysql) loaded.
21:00:50.018 [main] INFO o.a.g.t.w.WebSocketTunnelModule - Loading JSR-356
WebSocket support...
21:00:50.127 [main] INFO o.a.g.event.EventLoggingListener - The Apache
Guacamole web application has started.
21:00:50.420 [main] WARN o.g.jersey.server.wadl.WadlFeature - JAXBContext
implementation could not be found. WADL feature is disabled.
10-Oct-2025 21:00:50.600 INFO [main]
org.apache.catalina.startup.HostConfig.deployWAR Deployment of web application
archive [/tmp/catalina-base.f4H5RUfMwL/webapps/guacamole.war] has finished in
[3,579] ms
10-Oct-2025 21:00:50.603 INFO [main] org.apache.coyote.AbstractProtocol.start
Starting ProtocolHandler ["http-nio-8080"]
10-Oct-2025 21:00:50.608 INFO [main] org.apache.catalina.startup.Catalina.start
Server startup in [3618] milliseconds
21:01:13.379 [http-nio-8080-exec-8] WARN o.a.g.e.AuthenticationProviderFacade -
The "mysql" authentication provider has encountered an internal error which
will halt the authentication process. If this is unexpected or you are the
developer of this authentication provider, you may wish to enable debug-level
logging. If this is expected and you wish to ignore such failures in the
future, please set "skip-if-unavailable: mysql" within your
guacamole.properties<https://urldefense.proofpoint.com/v2/url?u=http-3A__guacamole.properties&d=DwQFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=FAi7_Un_xIwqyE1tNdU-gb08bRZLlfxR_VZo5-zbQF0&m=epgoL2yp5905aq-DMfXSwJUpsGM2zHiyiXdyHnSNvZeOtyxNP_hJvHSMGGIiKVyR&s=9sQBqx1R_6nMEW75bSiK9pPwOCSLKI2pa68IViJIlLU&e=>.
21:01:13.382 [http-nio-8080-exec-8] ERROR o.a.g.rest.RESTExceptionMapper -
Unexpected internal error:
### Error querying database. Cause: java.sql.SQLException: Error setting
driver on UnpooledDataSource.
### The error may exist in org/apache/guacamole/auth/jdbc/user/UserMapper.xml
### The error may involve
org.apache.guacamole.auth.jdbc.user.UserMapper.selectOne
### The error occurred while executing a query
### Cause: java.sql.SQLException: Error setting driver on UnpooledDataSource.
21:01:22.644 [http-nio-8080-exec-1] WARN o.a.g.e.AuthenticationProviderFacade -
The "mysql" authentication provider has encountered an internal error which
will halt the authentication process. If this is unexpected or you are the
developer of this authentication provider, you may wish to enable debug-level
logging. If this is expected and you wish to ignore such failures in the
future, please set "skip-if-unavailable: mysql" within your
guacamole.properties<https://urldefense.proofpoint.com/v2/url?u=http-3A__guacamole.properties&d=DwQFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=FAi7_Un_xIwqyE1tNdU-gb08bRZLlfxR_VZo5-zbQF0&m=epgoL2yp5905aq-DMfXSwJUpsGM2zHiyiXdyHnSNvZeOtyxNP_hJvHSMGGIiKVyR&s=9sQBqx1R_6nMEW75bSiK9pPwOCSLKI2pa68IViJIlLU&e=>.
21:01:22.644 [http-nio-8080-exec-1] ERROR o.a.g.rest.RESTExceptionMapper -
Unexpected internal error:
### Error querying database. Cause: java.sql.SQLException: Error setting
driver on UnpooledDataSource.
### The error may exist in org/apache/guacamole/auth/jdbc/user/UserMapper.xml
### The error may involve
org.apache.guacamole.auth.jdbc.user.UserMapper.selectOne
### The error occurred while executing a query
### Cause: java.sql.SQLException: Error setting driver on UnpooledDataSource.
21:01:32.940 [http-nio-8080-exec-9] WARN o.a.g.e.AuthenticationProviderFacade -
The "mysql" authentication provider has encountered an internal error which
will halt the authentication process. If this is unexpected or you are the
developer of this authentication provider, you may wish to enable debug-level
logging. If this is expected and you wish to ignore such failures in the
future, please set "skip-if-unavailable: mysql" within your
guacamole.properties<https://urldefense.proofpoint.com/v2/url?u=http-3A__guacamole.properties&d=DwQFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=FAi7_Un_xIwqyE1tNdU-gb08bRZLlfxR_VZo5-zbQF0&m=epgoL2yp5905aq-DMfXSwJUpsGM2zHiyiXdyHnSNvZeOtyxNP_hJvHSMGGIiKVyR&s=9sQBqx1R_6nMEW75bSiK9pPwOCSLKI2pa68IViJIlLU&e=>.
21:01:32.940 [http-nio-8080-exec-9] ERROR o.a.g.rest.RESTExceptionMapper -
Unexpected internal error:
### Error querying database. Cause: java.sql.SQLException: Error setting
driver on UnpooledDataSource.
### The error may exist in org/apache/guacamole/auth/jdbc/user/UserMapper.xml
### The error may involve
org.apache.guacamole.auth.jdbc.user.UserMapper.selectOne
### The error occurred while executing a query
### Cause: java.sql.SQLException: Error setting driver on UnpooledDataSource.
Tony
________________________________
This email has been scanned for spam and viruses by Proofpoint Essentials.
Click
here<https://us1.proofpointessentials.com/app/report_spam.php?mod_id=11&mod_option=logitem&report=1&type=easyspam&k=k1&payload=53616c7465645f5fc5539f128df8064be8507d24c2042ad67b521ee0abb0f0f6722a3049c58b90582c78a60891892548550a3946d823d8e678e19d16a499b283c9884cfd8ad3efc7cb404c2ed17699da2cc19185d9bc3e12769632cb0527eb90270288284ef42a238f6fc26be802e39d6aa5a9339eab41d5d07330e86513f6cd79fdae59be889db74e7a9351aa280d1e5289f5b858581ce49e260de29fcd6905>
to report this email as spam.
