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docs(inputs.conntrack): Explain different collection methods (#13691)

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43
plugins/inputs/conntrack/README.md
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@ -2,14 +2,26 @@
Collects stats from Netfilter's conntrack-tools. Collects stats from Netfilter's conntrack-tools.
The conntrack-tools provide a mechanism for tracking various aspects of There are two collection mechanisms for this plugin:
network connections as they are processed by netfilter. At runtime,
conntrack exposes many of those connection statistics within `/proc/sys/net`. ## /proc/net/stat/nf_conntrack
Depending on your kernel version, these files can be found in either
`/proc/sys/net/ipv4/netfilter` or `/proc/sys/net/netfilter` and will be When a user specifies the `collect` config option with valid options, then the
plugin will loop through the files in `/proc/net/stat/nf_conntrack` to find
CPU specific values.
## Specific files and dirs
The second mechanism is for the user to specify a set of directories and files
to search through
At runtime, conntrack exposes many of those connection statistics within
`/proc/sys/net`. Depending on your kernel version, these files can be found in
either `/proc/sys/net/ipv4/netfilter` or `/proc/sys/net/netfilter` and will be
prefixed with either `ip` or `nf`. This plugin reads the files specified prefixed with either `ip` or `nf`. This plugin reads the files specified
in its configuration and publishes each one as a field, with the prefix in its configuration and publishes each one as a field, with the prefix
normalized to ip_. normalized to ip_.
conntrack exposes many of those connection statistics within `/proc/sys/net`. conntrack exposes many of those connection statistics within `/proc/sys/net`.
Depending on your kernel version, these files can be found in either Depending on your kernel version, these files can be found in either
`/proc/sys/net/ipv4/netfilter` or `/proc/sys/net/netfilter` and will be `/proc/sys/net/ipv4/netfilter` or `/proc/sys/net/netfilter` and will be
@ -18,8 +30,8 @@ in its configuration and publishes each one as a field, with the prefix
normalized to `ip_`. normalized to `ip_`.
In order to simplify configuration in a heterogeneous environment, a superset In order to simplify configuration in a heterogeneous environment, a superset
of directory and filenames can be specified. Any locations that don't exist of directory and filenames can be specified. Any locations that does nt exist
will be ignored. are ignored.
For more information on conntrack-tools, see the For more information on conntrack-tools, see the
[Netfilter Documentation](http://conntrack-tools.netfilter.org/). [Netfilter Documentation](http://conntrack-tools.netfilter.org/).
@ -43,17 +55,20 @@ See the [CONFIGURATION.md][CONFIGURATION.md] for more details.
## Note the nf_ and ip_ filename prefixes are mutually exclusive across ## Note the nf_ and ip_ filename prefixes are mutually exclusive across
## kernel versions, as are the directory locations. ## kernel versions, as are the directory locations.
## Look through /proc/net/stat/nf_conntrack for these metrics
## all - aggregated statistics
## percpu - include detailed statistics with cpu tag
collect = ["all", "percpu"]
## User-specified directories and files to look through
## Directories to search within for the conntrack files above.
## Missing directories will be ignored.
dirs = ["/proc/sys/net/ipv4/netfilter","/proc/sys/net/netfilter"]
## Superset of filenames to look for within the conntrack dirs. ## Superset of filenames to look for within the conntrack dirs.
## Missing files will be ignored. ## Missing files will be ignored.
files = ["ip_conntrack_count","ip_conntrack_max", files = ["ip_conntrack_count","ip_conntrack_max",
"nf_conntrack_count","nf_conntrack_max"] "nf_conntrack_count","nf_conntrack_max"]
## Directories to search within for the conntrack files above.
## Missing directories will be ignored.
dirs = ["/proc/sys/net/ipv4/netfilter","/proc/sys/net/netfilter"]
## all - aggregated statistics
## percpu - include detailed statistics with cpu tag
collect = ["all", "percpu"]
``` ```
## Metrics ## Metrics

17
plugins/inputs/conntrack/sample.conf
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@ -5,14 +5,17 @@
## Note the nf_ and ip_ filename prefixes are mutually exclusive across ## Note the nf_ and ip_ filename prefixes are mutually exclusive across
## kernel versions, as are the directory locations. ## kernel versions, as are the directory locations.
## Look through /proc/net/stat/nf_conntrack for these metrics
## all - aggregated statistics
## percpu - include detailed statistics with cpu tag
collect = ["all", "percpu"]
## User-specified directories and files to look through
## Directories to search within for the conntrack files above.
## Missing directories will be ignored.
dirs = ["/proc/sys/net/ipv4/netfilter","/proc/sys/net/netfilter"]
## Superset of filenames to look for within the conntrack dirs. ## Superset of filenames to look for within the conntrack dirs.
## Missing files will be ignored. ## Missing files will be ignored.
files = ["ip_conntrack_count","ip_conntrack_max", files = ["ip_conntrack_count","ip_conntrack_max",
"nf_conntrack_count","nf_conntrack_max"] "nf_conntrack_count","nf_conntrack_max"]
## Directories to search within for the conntrack files above.
## Missing directories will be ignored.
dirs = ["/proc/sys/net/ipv4/netfilter","/proc/sys/net/netfilter"]
## all - aggregated statistics
## percpu - include detailed statistics with cpu tag
collect = ["all", "percpu"]