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MINOR: proxy: prevent backend removal when unsupported

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Prevent removal of a backend which relies on features not compatible
with dynamic backends. This is the case if either dispatch or
transparent option is used, or if a stick-table is declared.

These limitations are similar to the "add backend" ones.
This commit is contained in:
Amaury Denoyelle 2026-01-06 16:38:05 +01:00
parent ad1e00b2ac
commit 7bf3020952
2 changed files with 15 additions and 0 deletions
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5
doc/management.txt
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@ -2130,6 +2130,11 @@ del backend <name>
This operation is only possible for TCP or HTTP proxies. To succeed, the
backend instance must have been first unpublished.
There is also additional restrictions which prevent backend removal.
Currently, this is the case when deprecated dispatch or option transparent
are used. Also, a backend cannot be removed if there is a stick-table
declared in it.
This command is restricted and can only be issued on sockets configured for
level "admin". Moreover, this feature is still considered in development so it
also requires experimental mode (see "experimental-mode on").

10
src/proxy.c
View file

@ -5014,6 +5014,16 @@ int be_check_for_deletion(const char *bename, struct proxy **pb, const char **pm
goto out;
}
if (be->options & (PR_O_DISPATCH|PR_O_TRANSP)) {
msg = "Deletion of backend with deprecated dispatch/transparent options is not supported.";
goto out;
}
if (be->table) {
msg = "Cannot remove a backend with stick-table.";
goto out;
}
if (be->cap & PR_CAP_FE) {
msg = "Cannot delete a listen section.";
goto out;