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This allows CTDB to be configured to use "ss -K" to reset TCP connections on "releaseip". This is only supported when the kernel is configured with CONFIG_INET_DIAG_DESTROY enabled. From the documentation: ss -K has been supported in ss since iproute 4.5 in March 2016 and in the Linux kernel since 4.4 in December 2015. However, the required kernel configuration item CONFIG_INET_DIAG_DESTROY is disabled by default. Although enabled in Debian kernels since ~2017 and in Ubuntu since at least 18.04,, this has only recently been enabled in distributions such as RHEL. There seems to be no way, including running ss -K, to determine if this is supported, so use of this feature needs to be configurable. When available, it should be the fastest, most reliable way of killing connections. For RHEL and derivatives, this was enabled as follows: * RHEL 8 via https://bugzilla.redhat.com/show_bug.cgi?id=2230213, arriving in version kernel-4.18.0-513.5.1.el8_9 * RHEL 9 via https://issues.redhat.com/browse/RHEL-212, arriving in kernel-5.14.0-360.el9 Enabling this option results in a small behaviour change because ss -K always does a 2-way kill (i.e. it also sends a RST to the client). Only a 1-way kill is done for SMB connections when ctdb_killtcp is used - the reasons for this are shrouded in history and the 2-way kill seems to work fine. For the summary that is logged, when CTDB_KILLTCP_USE_SS_KILL is "yes" or "try", always log the method used, even the fallback to ctdb_killtcp. However, when set to "no", maintain the existing output. The decision to use -K rather than --kill is because short options are trivial to implement in test stubs. Signed-off-by: Martin Schwenke <mschwenke@ddn.com> Reviewed-by: Volker Lendecke <vl@samba.org> Reviewed-by: Jerry Heyman <jheyman@ddn.com> Autobuild-User(master): Martin Schwenke <martins@samba.org> Autobuild-Date(master): Thu Nov 7 00:12:34 UTC 2024 on atb-devel-224 |
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| .. | ||
| events | ||
| nfs-checks.d | ||
| ctdb-backup-persistent-tdbs.sh | ||
| ctdb-crash-cleanup.sh | ||
| ctdb.conf | ||
| ctdb.init | ||
| ctdb.sysconfig | ||
| ctdb.tunables | ||
| debug_locks.sh | ||
| debug-hung-script.sh | ||
| functions | ||
| nfs-linux-kernel-callout | ||
| notification.README | ||
| notify.sh | ||
| README | ||
| script.options | ||
This directory contains run-time support scripts for CTDB.
Selected highlights:
ctdb.init
An initscript for starting ctdbd at boot time.
events/
Eventscripts. See events/README for more details.
functions
Support functions, sourced by eventscripts and other scripts.
Notes:
* All of these scripts are written in POSIX Bourne shell. Please
avoid bash-isms, including the use of "local" variables (which are
not available in POSIX shell).
* Do not use absolute paths for commands. Unit tests attempt to
replace many commands with stubs and can not do this if commands are
specified with absolute paths. The functions file controls $PATH so
absolute paths should not be required.