Can not connect to oracle outside docker container - oracle

Question

I have create an image for the oracle 19c. I have started my container with below command.
docker run --name oracledb -d -p 1527:1521 -p 5700:5500 -e ORACLE_PWD=password1 -e ORACLE_CHARACTERSET=AL32UTF8 -v /d/docker-code/oracle-data oracle/database:19.3.0-ee
After creation of container, I am able to login in the container. I am able to connect with the below command inside the container.
sqlplus system/password1#172.17.0.2:1527/ORCLCDB
Outside of the container, from the cmd, I can not connect to that oracle instance.
Note: I have already installed oracle on the windows machine at port 1521 which is default port.
listener.ora
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
(ADDRESS = (PROTOCOL = TCP)(HOST = 172.17.0.2)(PORT = 1527))
)
)
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(GLOBAL_DBNAME = ORCLCDB)
(ORACLE_HOME = /opt/oracle/product/19c/dbhome_1)
(SID_NAME = ORCLCDB)
)
)
DEDICATED_THROUGH_BROKER_LISTENER=OFF
DIAG_ADR_ENABLED = off
tnsnames.ora
ORCLCDB=172.17.0.2:1527/ORCLCDB
ORCLPDB1=
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 172.17.0.2)(PORT = 1527))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = ORCLPDB1)
)
)
I am not able to connect from SQL Developer or from CMD. I am able to get timeout error when I am trying to access outside of the docker container.
ERROR:
ORA-12170: TNS:Connect timeout occurred
Please guide me to resolve this issue.
Thanks in Advance.

Answer 1

Make sure all container network interfaces are listening for database traffic, hence 0.0.0.0. Do not hardcode a docker bridge network address (172..) because this address will be assigned at container startup. Just stick with the default port 1521 local to the container. This port - 1521 - is local to the container and not exposed to the host OS. You publish this port to the host OS where you decide which port to use, hence -p 1522:1521
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
(ADDRESS = (PROTOCOL = TCP)(HOST = 0.0.0.0)(PORT = 1521))
)
)
Now you can fire up the container on your host OS by issuing:
docker run --name oracledb -d -p 1522:1521 -p 5700:5500 -e ORACLE_PWD=password1 -e ORACLE_CHARACTERSET=AL32UTF8 -v /d/docker-code/oracle-data oracle/database:19.3.0-ee
This should now work
sqlplus system/password1#localhost:1522/ORCLCDB
Tip. You can now pull Oracle XE 18c from Docker Hub. I recommend you to test this image if you still cannot connect using the image you have built.
docker run -d -p 1522:1521 --rm -e ORACLE_PASSWORD=Welcome_1 -v oracle-volume:/opt/oracle/oradata gvenzl/oracle-xe
docker container ls
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
97ce7cd3d7ca gvenzl/oracle-xe "container-entrypoin…" About an hour ago Up About an hour 0.0.0.0:1522->1521/tcp elegant_borg
sqlplus system/Welcome_1#localhost:1522/XE
SQL*Plus: Release 19.0.0.0.0 - Production on Mon May 31 10:21:18 2021
Version 19.8.0.0.0
Copyright (c) 1982, 2020, Oracle. All rights reserved.
Last Successful login time: Mon May 31 2021 10:20:19 +02:00
Connected to:
Oracle Database 18c Express Edition Release 18.0.0.0.0 - Production
Version 18.4.0.0.0
system#XE> set echo on
system#XE> #pdbs
system#XE>
system#XE> col con_id format 999
system#XE> col dbid format 99999999999999999
system#XE> col name format a30
system#XE> col open_mode format a10
system#XE> col open_time format a38
system#XE>
system#XE> select p1.con_id, p1.dbid, p1.name, p2.status, p1.open_mode, p1.open_time
2 from
3 v$pdbs p1 join dba_pdbs p2 on (p1.con_id = p2.con_id);
CON_ID DBID NAME STATUS OPEN_MODE OPEN_TIME
------ ------------------ ------------------------------ ---------- ---------- --------------------------------------
2 1957965804 PDB$SEED NORMAL READ ONLY 31.05.2021 06:54:00474 AM +00:00
3 4267393270 XEPDB1 NORMAL READ WRITE 31.05.2021 06:54:01229 AM +00:00
2 rows selected.
system#XE>
Best of luck!