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Chapter 6. Known Spring Boot Issues
6.1. Connection between a RHEL 8-based database application and a RHEL 7-based MySQL 5.7 database fails due to TLS protocol version mismatch
Description
Attempting to open a TLS-secured connection using OpenSSL between an application container built on a RHEL 8-based OpenJDK builder image and a database container built on a RHEL 7-based MySQL 5.7 container image results in a connection failure due to a javax.net.ssl.SSLHandshakeException at runtime: For more detail, view the issue in JIRA.
... Caused by: javax.net.ssl.SSLHandshakeException: No appropriate protocol (protocol is disabled or cipher suites are inappropriate) ...
...
Caused by: javax.net.ssl.SSLHandshakeException: No appropriate protocol (protocol is disabled or cipher suites are inappropriate)
...Cause
The issue occurs due to a difference in the latest supported TLS protocol version between RHEL 7 and RHEL 8. The TLS implementation on RHEL 7 supports TLS protocol versions 1.0 (deprecated), 1.1, and 1.2. The TLS implementation on RHEL 8 also supports TLS protocol version 1.3, which is also the default TLS version used in RHEL 8-based builder images. This discrepancy may cause a TLS protocol version mismatch between application components while negotiating a TLS handshake, which in turn causes the connection between the application and database containers to fail.
Workaround
To prevent the issue described above, manually specify a TLS protocol version that is supported on both operating system versions in your database connection string. For example:
jdbc:mysql://testdb-mysql:3306/testdb?enabledTLSProtocols=TLSv1.2
jdbc:mysql://testdb-mysql:3306/testdb?enabledTLSProtocols=TLSv1.2
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