Hi Nathan,
On Wed, 2015-09-09 at 18:36 -0400, Nathan Scott wrote:
>
> The problem is likely to be nginx not being configured to export stats,
> (they're not enabled by default). There's two things to check...
Indeed, I missed the part that I should configure nginx to export the
stats.
> Firstly, nginx must be compiled with HttpStubStatusModule module (this
> is on by default in Fedora). You can check that by running following
> command:
>
> $ nginx -V 2>&1 | grep -o with-http_stub_status_module
>
> If nothing is reported, nginx has been built without stats support, and
> it will require a recompile to resolve this.
Yes, fortunately, this module is compiled-in with nginx that is shipped
with the latest versions of Fedora and CentOS.
> Next, the server section of your /etc/nginx/nginx.conf needs to include:
>
> location /nginx_status {
> stub_status on;
> access_log off;
> allow 127.0.0.1;
> deny all;
> }
>
> Restart the nginx service, and you should see metric values.
Thanks for the nginx configuration instructions. I still had to overcome
two issues before I could get nginx's metric values:
1) I had to configure nginx to allow access via IPv6, otherwise, I would
get error messages like:
2015/09/10 08:20:26 [error] 4838#0: *1 access forbidden by rule,
client: ::1, server: _, request: "GET /nginx_status HTTP/1.1", host:
"localhost"
So the relevant part of /etc/nginx/nginx.conf should look like:
location /nginx_status {
stub_status on;
access_log off;
allow 127.0.0.1;
allow ::1;
deny all;
}
2) I had to temporarily disable SELinux, otherwise, I would get SELinux
denial messages like:
type=AVC msg=audit(1441874883.417:752): avc: denied { name_connect }
for pid=4754 comm="perl" dest=80
scontext=system_u:system_r:pcp_pmcd_t:s0
tcontext=system_u:object_r:http_port_t:s0 tclass=tcp_socket permissive=0
For 2), I don't know whether I should file this as a bug report with PCP
or distribution's (i.e. Fedora's) SELinux policy?
> There is a small bug in the error code being returned by the PMDA (from your
> earlier
> mail), this config stuff should be documented in pmdaginx(1), and we lack
> tests for this PMDA. I'll get those fixed up for the next PCP release,
> but you should be good to go with the configuration steps above.
I saw the commit, thanks for fixing this so quickly!
Cheers,
Tadej
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