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About this Docker Image

These Docker images contain the Oracle Instant Client 'Basic', 'SDK' and 'SQL*Plus' packages. They can be used to build and run Oracle Call Interface (OCI), Oracle C++ Call Interface (OCCI), and JDBC-OCI applications applications. The SQL*Plus command-line query tool allows quick ad-hoc SQL and PL/SQL execution. The Docker images can be extended with optional packages for ODBC, or to include tools such as Oracle SQL*Loader.

The base images support building and using scripting language APIs that internally call OCI. These include Python's cx_Oracle, Node.js's node-oracledb, PHP's OCI8, Go's goracle and Ruby's ruby-oci8.

About Oracle Instant Client

The Oracle Instant Client is a repackaging of Oracle Database libraries, tools and header files usable to create and run applications that connect to a remote (or local) Oracle Database.

Oracle client-server version interoperability is detailed in Doc ID 207303.1. In summary, applications using Oracle Call Interface (OCI) 19, 18 and 12.2 can connect to Oracle Database 11.2 or later. Some tools may have other restrictions.

From release 18.3, the Oracle Instant Client RPMs for Oracle Linux are available for direct download from the Oracle Linux yum server without requiring manual license acceptance.

Building the Oracle Instant Client 19 Image

Change directory to dockerfiles/19 and run:

docker build --pull -t oracle/instantclient:19 .

The build process automatically installs Instant Client using RPMs directly from the Oracle Instant Client repository on the Oracle Linux yum server.

Applications using Oracle Call Interface (OCI) 19 can connect to Oracle Database 11.2 or later. Some tools may have other restrictions.

Building the Oracle Instant Client 18 Image

Change directory to dockerfiles/18 and run:

docker build --pull -t oracle/instantclient:18 .

The build process will automatically install the Instant Client using RPMs sourced directly from the Oracle Instant Client repository on the Oracle Linux yum server.

Applications using Oracle Call Interface (OCI) 18 can connect to Oracle Database 11.2 or later. Some tools may have other restrictions.

Building the Oracle Instant Client 12.2 Image

Download the following three RPMs from the Instant Client download page on the Oracle Technology Network:

  • oracle-instantclient12.2-basic-12.2.0.1.0-1.x86_64.rpm
  • oracle-instantclient12.2-devel-12.2.0.1.0-1.x86_64.rpm
  • oracle-instantclient12.2-sqlplus-12.2.0.1.0-1.x86_64.rpm

Place the downloaded Oracle Instant Client RPMs (from the previous step) in the dockerfiles/12.2.0.1 directory, then switch to that directory and run:

docker build --pull -t oracle/instantclient:12.2.0.1 .

Applications using Oracle Call Interface (OCI) 12.2 can connect to Oracle Database 11.2 or later. Some tools may have other restrictions.

Running a Container

These Dockerfiles include SQL*Plus so you can interactively run a container to execute ad-hoc SQL and PL/SQL statements against your database, for example:

docker run -ti --rm oracle/instantclient:19 sqlplus [email protected]/orclpdb1

Optional Oracle Net and Oracle Client Configuration Files

Optional Oracle Network and Oracle client configuration files can be copied or mounted to the default configuration file directory /usr/lib/oracle/<version>/client64/lib/network/admin. Optional files include tnsnames.ora, sqlnet.ora, oraaccess.xml and cwallet.sso.

When files are in the default directory, you do not need to set Oracle's TNS_ADMIN environment variable.

For Instant Client 12.2, and earlier, you must explicitly create the directory.

Using Wallets with Instant Client

Oracle Wallets allow database connection over TLS and/or without requiring database credentials.

To use a wallet with Instant Client, obtain your wallet files and place them in a secure host directory. Then, when running a container, use a volume to mount the files to the default Instant Client network configuration file directory, for example:

docker run -v /my/host/wallet_dir:/usr/lib/oracle/19.6/client64/lib/network/admin:Z,ro . . .

You should review which volume options are required. The Z option is needed when selinux is in effect, see "Configure the selinux label" in Use bind mounts.

If you have a wallet zip downloaded from an Oracle Cloud Database then you should unzip it and, in this example, place the extracted files in /my/host/wallet_dir on your host. Cloud database wallets provide connection strings for the database service and enable TLS. Your container applications should use one of the connection strings from tnsnames.ora and also supply a valid database username and password for connection. If you are using C based applications (including database drivers for Python, Node.js, Go, Ruby or PHP) you only need the tnsnames.ora, sqlnet.ora and cwallet.sso files from the zip file. Keep the files secure.

Adding Oracle Database Drivers

To extend the image with optional Oracle Database drivers, follow your desired driver installation steps. The Instant Client libraries are in /usr/lib/oracle/<version>/client64/lib and the Instant Client headers are in /usr/include/oracle/<version>/client64/.

The Instant Client libraries are in the default library search path.