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| author | Chris Akritidis <43294513+cakrit@users.noreply.github.com> | 2018-12-06 18:16:05 +0100 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2018-12-06 18:16:05 +0100 |
| commit | f1036f74f7045ecca98ce2cad96ab7b6b0c239d1 (patch) | |
| tree | 9ec931d8e6d91e23beb0795fe20f9bf622549c94 /docs/netdata-for-IoT.md | |
| parent | 31f14e5855c133aefba4aa91a5466f19bb1be540 (diff) | |
Config docs improvements (#4918)
* WIP to add a new config readme
* WIP
* WIP
* WIP
* WIP
* WIP
* Major rewrite of configuration instructions and minor improvements to the html doc site
* Major rewrite of configuration instructions and minor improvements to the html doc site
* Major rewrite of configuration instructions and minor improvements to the html doc site
* Major rewrite of configuration instructions and minor improvements to the html doc site
* Major rewrite of configuration instructions and minor improvements to the html doc site
* Major rewrite of configuration instructions and minor improvements to the html doc site
* Major rewrite of configuration instructions and minor improvements to the html doc site
* Major rewrite of configuration instructions and minor improvements to the html doc site
Diffstat (limited to 'docs/netdata-for-IoT.md')
| -rw-r--r-- | docs/netdata-for-IoT.md | 164 |
1 files changed, 2 insertions, 162 deletions
diff --git a/docs/netdata-for-IoT.md b/docs/netdata-for-IoT.md index ea77987221..515276f426 100644 --- a/docs/netdata-for-IoT.md +++ b/docs/netdata-for-IoT.md @@ -20,169 +20,9 @@ The netdata web API already provides **reduce** functions allowing it to report  -Although netdata has been significantly optimized to lower the CPU and RAM resources it consumes, the plethora of data collection plugins may be inappropriate for weak IoT devices. +Although netdata has been significantly optimized to lower the CPU and RAM resources it consumes, the plethora of data collection plugins may be inappropriate for weak IoT devices. Please follow the guide on [running netdata in embedded devices](Performance.md) -> keep in mind that netdata on RPi 2 and 3 does not require any tuning. The default settings will be good. The following tunables apply only when running netdata on RPi 1 or other very weak IoT devices. - -Here are a few tricks to control the resources consumed by netdata: - -## 1. Disable External plugins - -External plugins can consume more system resources than the netdata server. Disable the ones you don't need. - -Edit `/etc/netdata/netdata.conf`, find the `[plugins]` section: - -``` -[plugins] - proc = yes - - tc = no - idlejitter = no - cgroups = no - checks = no - apps = no - charts.d = no - node.d = no - - plugins directory = /usr/libexec/netdata/plugins.d - enable running new plugins = no - check for new plugins every = 60 -``` - -In detail: - -plugin|description -:---:|:--------- -`proc`|the internal plugin used to monitor the system. Normally, you don't want to disable this. You can disable individual functions of it at the next section. -`tc`|monitoring network interfaces QoS (tc classes) -`idlejitter`|internal plugin (written in C) that attempts show if the systems starved for CPU. Disabling it will eliminate a thread. -`cgroups`|monitoring linux containers. Most probably you are not going to need it. This will also eliminate another thread. -`checks`|a debugging plugin, which is disabled by default. -`apps`|a plugin that monitors system processes. It is very complex and heavy (heavier than the netdata daemon), so if you don't need to monitor the process tree, you can disable it. -`charts.d`|BASH plugins (squid, nginx, mysql, etc). This is again a heavy plugin. -`node.d`|node.js plugin, currently used for SNMP data collection and monitoring named (the name server). - -For most IoT devices, you can disable all plugins except `proc`. For `proc` there is another section that controls which functions of it you need. Check the next section. - ---- - -## 2. Disable internal plugins - -In this section you can select which modules of the `proc` plugin you need. All these are run in a single thread, one after another. Still, each one needs some RAM and consumes some CPU cycles. - -``` -[plugin:proc] - # /proc/net/dev = yes # network interfaces - # /proc/diskstats = yes # disks - # /proc/net/snmp = yes # generic IPv4 - # /proc/net/snmp6 = yes # generic IPv6 - # /proc/net/netstat = yes # TCP and UDP - # /proc/net/stat/conntrack = yes # firewall - # /proc/net/ip_vs/stats = yes # IP load balancer - # /proc/net/stat/synproxy = yes # Anti-DDoS - # /proc/stat = yes # CPU, context switches - # /proc/meminfo = yes # Memory - # /proc/vmstat = yes # Memory operations - # /proc/net/rpc/nfsd = yes # NFS Server - # /proc/sys/kernel/random/entropy_avail = yes # Cryptography - # /proc/interrupts = yes # Interrupts - # /proc/softirqs = yes # SoftIRQs - # /proc/loadavg = yes # Load Average - # /sys/kernel/mm/ksm = yes # Memory deduper - # netdata server resources = yes # netdata charts -``` - ---- - -## 3. Disable logs - -Normally, you will not need them. To disable them, set: - -``` -[global] - debug log = none - error log = none - access log = none -``` - ---- - -## 4. Set memory mode to RAM - -Setting the memory mode to `ram` will disable loading and saving the round robin database. This will not affect anything while running netdata, but it might be required if you have very limited storage available. - -``` -[global] - memory mode = ram -``` - ---- - -## 5. CPU utilization - -If after disabling the plugins you don't need, netdata still uses a lot of CPU without any clients accessing the dashboard, try lowering its data collection frequency. Going from "once per second" to "once every two seconds" will not have a significant difference on the user experience, but it will cut the CPU resources required **in half**. - -To set the update frequency, edit `/etc/netdata/netdata.conf` and set: - -``` -[global] - update every = 2 -``` - -You may have to increase this to 5 or 10 if the CPU of the device is weak. - -Keep in mind this will also force dashboard chart refreshes to happen at the same rate. So increasing this number actually lowers data collection frequency but also lowers dashboard chart refreshes frequency. - -This is a dashboard on a device with `[global].update every = 5` (this device is a media player and is now playing a movie): - - - ---- - -## 6. Lower memory requirements - -You can set the default size of the round robin database for all charts, using: - -``` -[global] - history = 600 -``` - -The units for history is `[global].update every` seconds. So if `[global].update every = 6` and `[global].history = 600`, you will have an hour of data ( 6 x 600 = 3.600 ), which will store 600 points per dimension, one every 6 seconds. - -Check also [[Memory Requirements]] for directions on calculating the size of the round robin database. - ---- - -## 7. Disable gzip compression of responses - -Gzip compression of the web responses is using more CPU that the rest of netdata. You can lower the compression level or disable gzip compression completely. You can disable it, like this: - -``` -[web] - enable gzip compression = no -``` - -To lower the compression level, do this: - -``` -[web] - enable gzip compression = yes - gzip compression level = 1 -``` - ---- - -Finally, if no web server is installed on your device, you can use port tcp/80 for netdata: - -``` -[global] - port = 80 -``` - ---- - -## 8. Monitoring RPi temperature +## Monitoring RPi temperature The python version of the sensors plugin uses `lm-sensors`. Unfortunately the temperature reading of RPi are not supported by `lm-sensors`. |