docker – Page 9 – Kev's Development Toolbox

February 23, 2020March 4, 2025

Docker with remote servers

2025 update: Use docker contexts instead.

Original post:

If you’re running Docker without TLS (hopefully never in production, for dev only), set DOCKER_HOST to host-ip:2375 and should should be good to go:

export DOCKER_HOST=tcp://host-ip:2375

If you’re using TLS certs, point to 2376 on the remote machine and specify a path to the certs:

export DOCKER_HOST=tcp://host-ip:2376
export DOCKER_CERT_PATH=/path/to/certs

Pass the –tlsverify param to ensure certs are passed with command:

docker --tlsverify command

Use docker-compose against a remote machine with TLS certs:

docker-compose -H remote-server-ip:2376 --tlscacert ca.pem --tlscert cert.pem --tlskey key.pem -f docker-compose.yml up

How to setup your Docker server to use TLS certs is here: https://docs.docker.com/engine/security/https/

May 23, 2019May 23, 2019

Running Oracle 19c in a Docker container: part 2: server up and running

Following on from my first attempt to get Oracle 19c running in a Docker container and running out of disk space in my VM, I increased the disk space to 40GB and restarted the steps to build the image. It took about 1.5hrs to complete building and doing the install into the image. Although building an image is a one time activity, unless you’re making changes to the image that’s still a long time, and not something you can do on a regular basis or on demand.

Next, starting up an container from the image, using the provided docker command from the docs:

docker run --name <container name> \
-p <host port>:1521 -p <host port>:5500 \
-e ORACLE_SID=<your SID> \
-e ORACLE_PDB=<your PDB name> \
-e ORACLE_PWD=<your database passwords> \
-e ORACLE_CHARACTERSET=<your character set> \
-v [<host mount point>:]/opt/oracle/oradata \
oracle/database:19.3.0-se2

It then takes around 30mins before the server is actually up and running. At least it gives you some percentage status outputs as it’s starting up, but again, not really practical for starting a server up ondemand or on a whim. For reference, this is on my HP DL380 G7 server with dual 2.4GHz Xeons, running in an Ubuntu 18.04 VM with 4 vCpus and 8GB RAM.

Up and running:

LSNRCTL for Linux: Version 19.0.0.0.0 - Production on 24-MAY-2019 04:55:03
 Copyright (c) 1991, 2019, Oracle.  All rights reserved.
 Starting /opt/oracle/product/19c/dbhome_1/bin/tnslsnr: please wait…
 TNSLSNR for Linux: Version 19.0.0.0.0 - Production
 System parameter file is /opt/oracle/product/19c/dbhome_1/network/admin/listener.ora
 Log messages written to /opt/oracle/diag/tnslsnr/8363ae964727/listener/alert/log.xml
 Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC1)))
 Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=0.0.0.0)(PORT=1521)))
 Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1)))
 STATUS of the LISTENER
 Alias                     LISTENER
 Version                   TNSLSNR for Linux: Version 19.0.0.0.0 - Production
 Start Date                24-MAY-2019 04:55:04
 Uptime                    0 days 0 hr. 0 min. 1 sec
 Trace Level               off
 Security                  ON: Local OS Authentication
 SNMP                      OFF
 Listener Parameter File   /opt/oracle/product/19c/dbhome_1/network/admin/listener.ora
 Listener Log File         /opt/oracle/diag/tnslsnr/8363ae964727/listener/alert/log.xml
 Listening Endpoints Summary…
   (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC1)))
   (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=0.0.0.0)(PORT=1521)))
 The listener supports no services
 The command completed successfully
 
 Prepare for db operation
 8% complete
 Copying database files
 31% complete
 Creating and starting Oracle instance
 32% complete
 36% complete
 40% complete
 43% complete
 46% complete
 Completing Database Creation
 51% complete
 54% complete
 Creating Pluggable Databases
 58% complete
 77% complete
 Executing Post Configuration Actions
 100% complete
 Database creation complete. For details check the logfiles at:
  /opt/oracle/cfgtoollogs/dbca/ORADB1.
 Database Information:
 Global Database Name:ORADB1
 System Identifier(SID):ORADB1
 Look at the log file "/opt/oracle/cfgtoollogs/dbca/ORADB1/ORADB1.log" for further details.
 SQL*Plus: Release 19.0.0.0.0 - Production on Fri May 24 05:17:49 2019
 Version 19.3.0.0.0
 Copyright (c) 1982, 2019, Oracle.  All rights reserved.
 Connected to:
 Oracle Database 19c Standard Edition 2 Release 19.0.0.0.0 - Production
 Version 19.3.0.0.0

Created a connection in SQLDeveloper and can connect!

May 22, 2019May 23, 2019

Running Oracle 19c in a Docker container: part 1: out of disk space on my VM

This should be filed under “Can you? Yes. Should you? Probably not”

I tried creating a Docker container running Oracle 19c from Oracle official dockerfiles, and straight out of the gate ran out of diskspace:


 
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 
checkSpace.sh: ERROR - There is not enough space available in the docker container. 
checkSpace.sh: The container needs at least 18 GB, but only 14 GB are available. 
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 
Removing intermediate container b53a5e13a45c 
The command '/bin/sh -c chmod ug+x $INSTALL_DIR/*.sh &&     sync &&     $INSTALL_DIR/$CHECK_SPACE_FILE &&     $INSTALL_DIR/$SETUP_LINUX_FILE &&     rm -rf $INSTALL_DIR' returned a non-zero code: 1 


ERROR: Oracle Database Docker Image was NOT successfully created. 
ERROR: Check the output and correct any reported problems with the docker build operation. 

$ df -h 
Filesystem      Size  Used Avail Use% Mounted on 
udev            3.9G     0  3.9G   0% /dev 
tmpfs           798M  1.3M  797M   1% /run 
/dev/sda2        30G   12G   17G  41% /

The container needs at least 18GB? Of course it does.

Time to expand my VM disk space (using notes from when I previously had to do this here), and try again.