These thresholds are in relationship to the
`autovacuum_freeze_max_age`, *not* the XID wraparound, which happens
at 2^31-1. As such, it is *perfectly normal* that they hit 100%, and
then autovacuum kicks in and brings it back down. The unusual
condition is that PostgreSQL pushes past the point where an autovacuum
would be triggered -- therein lies the XID wraparound danger.
With the `autovacuum_freeze_max_age` set to 2000000000 in
`postgresql.conf`, XID wraparound happens at 107.3%. Set the warning
and error thresholds to below this, but above 100% so this does not
trigger constantly.
This makes it parallel with deliver_scheduled_messages, and clarifies
that it is not used for simply sending outgoing emails (e.g. the
`email_senders` queue).
This also renames the supervisor job to match.
Matching the full process name (-x without -f) or full command
line (-xf) is less prone to mistakes like matching a random substring
of some other command line or pgrep matching itself.
Signed-off-by: Anders Kaseorg <anders@zulip.com>
Thumbor and tc-aws have been dragging their feet on Python 3 support
for years, and even the alphas and unofficial forks we’ve been running
don’t seem to be maintained anymore. Depending on these projects is
no longer viable for us.
Signed-off-by: Anders Kaseorg <anders@zulip.com>
The `en_US.UTF-8` locale may not be configured or generated on all
installs; it also requires that the `locales` package be installed.
If users generate the `en_US.UTF-8` locale without adding it to the
permanent set of system locales, the generated `en_US.UTF-8` stops
working when the `locales` package is updated.
Switch to using `C.UTF-8` in all cases, which is guaranteed to be
installed.
Fixes#15819.
In puppet, we use pgrep in the collection stage, to see if rabbitmq is
running. Sufficiently bare-bones systems will not have
`procps` (which provides `pgrep`) installed yet, which makes the
install abort when running `puppet` for the first time.
Just installing the `procps` package in Puppet is insufficient,
because the check in the `unless` block runs when Puppet is
determining which resources it needs to instantiate, and in what
order; any package installation has yet to happen. As
`erlang-base` (which provides `epmd`) happens to have a dependency of
`procps`, any system without `pgrep` will also not have `epmd`
installed or running. Regardless, it is safe to run `epmd -daemon`
even if one is already running, as the comment above notes.
Using `pgrep -f epmd` to determine if `empd` is running is a race
condition with itself, since the pgrep is attempting to match the
"full process name" and its own full process name contains "epmd".
This leads to epmd not being started when it should be, which in turn
leads to rabbitmq-server failing to start.
Use the standard trick for this, namely a one-character character
class, to prevent self-matching.
We use the snakeoil TLS certificate for PostgreSQL and Postfix; some
VMs install the `ssl-cert` package but (reasonably) don't build the
snakeoil certs into the image.
Build them as needed.
Fixes#14955.
`uploads-route.noserve` and `uploads-route.internal` contained
identical location blocks for `/upload`, since differentiation was
necessary for Trusty until 33c941407b72; move the now-common sections
into `app`.
This the only differences between internal and S3 serving as a single
block which should be included or not based on config; move it to a
file which may or may not be placed in `app.d/`.
07779ea879 added an additional `proxy_set_header` of `X-Real-IP` to
`puppet/zulip/files/nginx/zulip-include-common/proxy`; as noted in
that commit, Tornado longpoll proxies already included such a line.
Unfortunately, this equates to setting that header _twice_ for Tornado
ports, like so:
```
X-Real-Ip: 198.199.116.58
X-Real-Ip: 198.199.116.58
```
...which is represented, once parsed by Django, as an IP of
`198.199.116.58, 198.199.116.58`. For IPv4, this odd "IP address" has
no problems, and appears in the access logs accordingly; for IPv6
addresses, however, its length is such that it overflows a call to
`getaddrinfo` when attempting to determine the validity of the IP.
Remove the now-duplicated inclusion of the header.
The `X-Forwarded-For` header is a list of proxies' IP addresses; each
proxy appends the remote address of the host it received its request
from to the list, as it passes the request down. A naïve parsing, as
SetRemoteAddrFromForwardedFor did, would thus interpret the first
address in the list as the client's IP.
However, clients can pass in arbitrary `X-Forwarded-For` headers,
which would allow them to spoof their IP address. `nginx`'s behavior
is to treat the addresses as untrusted unless they match an allowlist
of known proxies. By setting `real_ip_recursive on`, it also allows
this behavior to be applied repeatedly, moving from right to left down
the `X-Forwarded-For` list, stopping at the right-most that is
untrusted.
Rather than re-implement this logic in Django, pass the first
untrusted value that `nginx` computer down into Django via `X-Real-Ip`
header. This allows consistent IP addresses in logs between `nginx`
and Django.
Proxied calls into Tornado (which don't use UWSGI) already passed this
header, as Tornado logging respects it.
This verifies that the proxy is working by accessing a
highly-available website through it. Since failure of this equates to
failures of Sentry notifications and Android mobile push
notifications, this is a paging service.
All of `/var/log/nginx/` is chown'd to `zulip` and the nginx processes
themselves run as `nginx`, and would thus (on their own) create new
logfiles as `zulip`. Having `logrotate` create them as the package
default of `www-data` means that they are momentarily unreadable by
the `zulip` user just after rotation, which can cause problems with
logtail scripts.
Commit the standard `nginx` logrotate configuration, but with the
`zulip` user instead of the `www-data` user.
0663b23d54 changed zulip-puppet-apply to
use the venv, because it began using `yaml` to parse the output of
puppet to determine if changes would happen.
However, not every install ends with a venv; notably, non-frontend
servers do not have one. Attempting to run zulip-puppet-apply on them
hence now fails.
Remove this dependency on the venv, by installing a system
python3-yaml package -- though in reality, this package is already an
indirect dependency of the system. Especially since pyyaml is quite
stable, we're not using it in any interesting way, and it does not
actually add to the dependencies, it is preferable to parsing the YAML
by hand in this instance.
This reverts commit 211232978f. The
`rabbitmq` user does not exist yet on first install, and the goal is
to create the `rabbitmq-env.conf` file before the package is
installed.
In production, the `wildcard-zulipchat.com.combined-chain.crt` file is
just a symlink to the snakeoil certificates; but we do not puppet that
symlink, which makes new hosts fail to start cleanly. Instead, point
explicitly to the snakeoil certificate, and explain why.
Directives in `location` blocks may or may not inherit from
surrounding `location` blocks; specifically, `add_header` directives
do not[1]:
> There could be several add_header directives. These directives are
> inherited from the previous configuration level if and only if there
> are no add_header directives defined on the current level.
In order to maintain the same headers (including, critically,
`Access-Control-Allow-Origin`) as the surrounding block, all
`add_header` directives must thus be repeated (which includes the
`include`).
For clarity, un-nest and repeat the entire `location` block as was
used for `/static/`, but with the additional `add_header`. This is
preferred to the of an `if $request_uri` statement to add the header,
as those can have unexpected or undefined results[2].
[1] http://nginx.org/en/docs/http/ngx_http_headers_module.html#add_header
[2] https://www.nginx.com/resources/wiki/start/topics/depth/ifisevil/
Redis is not nagios, and this only leads to confusion as to why there
is a nagios domain setting on frontend servers; it also leaves the
`redis0` part of the name buried in the template.
Switch to an explicit variable for the redis hostname.
This is more broadly useful than for just Kandra; provide
documentation and means to install Smokescreen for stand-alone
servers, and motivate its use somewhat more.
This means that in steady-state, `zulip-puppet-apply` is expected to
produce no changes or commands to execute. The verification step of
`setup-apt-repo` is quite fast, so this cleans up the output for very
little cost.
Alex Vandiver
Anders Kaseorg
Tim Abbott
Jennifer Hwang
Gaurav Pandey