> WARNING Memory overcommit must be enabled! Without it, a background save or replication may fail under low memory condition.
> Being disabled, it can also cause failures without low memory condition, see https://github.com/jemalloc/jemalloc/issues/1328.
> To fix this issue add 'vm.overcommit_memory = 1' to /etc/sysctl.conf and then reboot or run the command 'sysctl vm.overcommit_memory=1' for this to take effect.
these changes were generated with nixq 0.0.2, by running
nixq ">> lib.mdDoc[remove] Argument[keep]" --batchmode nixos/**.nix
nixq ">> mdDoc[remove] Argument[keep]" --batchmode nixos/**.nix
nixq ">> Inherit >> mdDoc[remove]" --batchmode nixos/**.nix
two mentions of the mdDoc function remain in nixos/, both of which
are inside of comments.
Since lib.mdDoc is already defined as just id, this commit is a no-op as
far as Nix (and the built manual) is concerned.
The main idea behind that was to be able to do more sophisticated
merging for stuff that goes into `postgresql.conf`:
`shared_preload_libraries` is a comma-separated list in a `types.str`
and thus not mergeable. With this change, the option accepts both a
comma-separated string xor a list of strings.
This can be implemented rather quick using `coercedTo` +
freeform modules. The interface still behaves equally, but it allows to
merge declarations for this option together.
One side-effect was that I had to change the `attrsOf (oneOf ...)` part into
a submodule to allow declaring options for certain things. While at it,
I decided to move `log_line_prefix` and `port` into this structure as
well.
This was proposed by abbradar in #150801, but left out of the follow up PR
#221851 by Ma27 to reduce the size of the diff. Compared to the initial
proposal this includes the callPackage call in the recursion, which avoids
breaking the withJIT/withoutJIT helpers.
In terms of nixpkgs, this is a pure refactor, no derivations change. However,
this makes downstream expressions like the following possible:
(postgresql.override { jitSupport = true; }).pkgs.postgis
This would have not worked before without passing another "this" argument,
which is error prone as can be seen in this example:
https://github.com/PostgREST/postgrest/pull/3222/files
This makes it less error-prone to use the llvm package in extensions, because
it will always match the package used by the postgresql derivation itself.
Previously, you could've accidentally used llvm instead of postgresql.llvm
with a different result.
While `/var/lib/lldap` isn't technically accessible by unprivileged
users thanks to `DynamicUser=true`, a user might prefer and change it to
`DynamicUser=false`.
There is currently also a PR open that intends to make `DynamicUser`
configurable via module option.
As such, `jwt_secret_file`, if bootstrapped by the service start
procedure, might be rendered world-readable due to its permissions
(`0644/-rw-r--r--`) defaulting to the service's umask (`022`) and
`/var/lib/lldap` to `0755/drwxr-xr-x` due to `StateDirectoryMode=0755`.
This would usually be fixed by using `(umask 027; openssl ...)` instead
of just `openssl ...`.
However, it was found that another file (`users.db`), this time
bootstrapped by `lldap` itself, also had insufficient permissions
(`0644/-rw-r--r--`) inherited by the global umask and would be left
world-readable as well.
Due to this, we instead change the service's to `027`.
And to lower the impact for already bootstrapped files on existing
instances like `users.db`, set `StateDirectoryMode=0750`.
...effectively what was planned already in #266270, but it was too late
because the branches were restricted and didn't allow any breaking
changes anymore.
It also suffers from the same issue that we already had when discussing
this the last time[1] when `ensureDBOwnership` was ultimately introduced
as band-aid fix: newly created users don't get CREATE permission on
the `public` schema anymore (since psql 15), even with `ALL PRIVILEGES`.
If one's use-case is more sophisticated than having a single owner, it's
questionable anyways if this module is the correct tool since
permissions aren't dropped on a change to this option or a removal which
is pretty surprising in the context of NixOS.
[1] https://github.com/NixOS/nixpkgs/pull/266270
Since 2c5abd89c7 setting the option `boot.kernel.sysctl."net.core.rmem_max"` no longer has any downsides compared to what was previously used. Since 439350753e the same is also true for `boot.kernel.sysctl."net.core.wmem_max"`.
Do not assume that port and unixSocket are the only options that affect
address families used by Redis. There are other options, e.g. tls-port,
and also clustered setup that are not covered by the declarative
configuration. Instead of trying to selectively restrict unused address
families based on the configuration, limit address families to IP and
Unix sockets and let users lib.mkForce a stricter sandboxing is needed.
See also
https://docs.redis.com/latest/rs/networking/port-configurations/
When `services.firebird.enable` following error is thrown:
error: cannot coerce an integer to a string
After explicitly cast the port (integer) to string the error disappears.
As it is technically a breaking change, we should at least make a strong deprecation
of `ensurePermissions` and leave it in the broken state it is, for out of tree users.
We give them a 6 months notice to migrate away by doing so, which is honest.
In the meantime, we forbid usage of `ensurePermissions` inside of nixpkgs.
Closes #216989
First of all, a bit of context: in PostgreSQL, newly created users don't
have the CREATE privilege on the public schema of a database even with
`ALL PRIVILEGES` granted via `ensurePermissions` which is how most of
the DB users are currently set up "declaratively"[1]. This means e.g. a
freshly deployed Nextcloud service will break early because Nextcloud
itself cannot CREATE any tables in the public schema anymore.
The other issue here is that `ensurePermissions` is a mere hack. It's
effectively a mixture of SQL code (e.g. `DATABASE foo` is relying on how
a value is substituted in a query. You'd have to parse a subset of SQL
to actually know which object are permissions granted to for a user).
After analyzing the existing modules I realized that in every case with
a single exception[2] the UNIX system user is equal to the db user is
equal to the db name and I don't see a compelling reason why people
would change that in 99% of the cases. In fact, some modules would even
break if you'd change that because the declarations of the system user &
the db user are mixed up[3].
So I decided to go with something new which restricts the ways to use
`ensure*` options rather than expanding those[4]. Effectively this means
that
* The DB user _must_ be equal to the DB name.
* Permissions are granted via `ensureDBOwnerhip` for an attribute-set in
`ensureUsers`. That way, the user is actually the owner and can
perform `CREATE`.
* For such a postgres user, a database must be declared in
`ensureDatabases`.
For anything else, a custom state management should be implemented. This
can either be `initialScript`, doing it manual, outside of the module or
by implementing proper state management for postgresql[5], but the
current state of `ensure*` isn't even declarative, but a convergent tool
which is what Nix actually claims to _not_ do.
Regarding existing setups: there are effectively two options:
* Leave everything as-is (assuming that system user == db user == db
name): then the DB user will automatically become the DB owner and
everything else stays the same.
* Drop the `createDatabase = true;` declarations: nothing will change
because a removal of `ensure*` statements is ignored, so it doesn't
matter at all whether this option is kept after the first deploy (and
later on you'd usually restore from backups anyways).
The DB user isn't the owner of the DB then, but for an existing setup
this is irrelevant because CREATE on the public schema isn't revoked
from existing users (only not granted for new users).
[1] not really declarative though because removals of these statements
are simply ignored for instance: https://github.com/NixOS/nixpkgs/issues/206467
[2] `services.invidious`: I removed the `ensure*` part temporarily
because it IMHO falls into the category "manage the state on your
own" (see the commit message). See also
https://github.com/NixOS/nixpkgs/pull/265857
[3] e.g. roundcube had `"DATABASE ${cfg.database.username}" = "ALL PRIVILEGES";`
[4] As opposed to other changes that are considered a potential fix, but
also add more things like collation for DBs or passwords that are
_never_ touched again when changing those.
[5] As suggested in e.g. https://github.com/NixOS/nixpkgs/issues/206467
As described in the release lifecycle docs from postgresql[1], v11 will
stop receiving fixes as of Nov 9 2023. This means it's EOL throughout
the entire lifetime of 23.11, so let's drop it now.
A lot of examples are also referencing postgresql_11. Where it's
sensible, use postgresql_15 as example now to avoid confusion.
This is also handy because the LLVM 16 fix for postgresql is not
available for postgresql 11 ;-)
[1] https://www.postgresql.org/support/versioning/
