15 KiB
Zabbix (Agent) Framework
This tool is used to maintain external zabbix checks in one place. There are lot of places where it is possible to download many external checks. But there is problem with installation, update and centralised management. This tool should do all of this in easy steps. In future it can be starting point to install and configure zabbix agent on systems with one step. Primary goal is not to make all plugins available here but to be able to use any plugin and decentralized development. If you are maintainer of some external check, it is enough to create zaf file in your repo and use zaf installer everywhere.
Next to this, this tool can even communicate with Zabbix API with NO dependencies to high level languages. Shell, sed and awk only.
Motivation
Did you install lot of zabbix agents and try to setup similar common user parameters? Do you want to setup them all? Do you want to change some zabbix agent options on lot of system? Do you want to write your own simple check or discovery rule for zabbix and it is nightmare to deploy same script on more zabbix agents? Are you tired searching some system specific agent check and setup them individualy? Do you want to auto simple backup all hosts in your zabbix to xml files? Or do you want to do some scripting on host depending on Zabbix server configuration? So zaf is here for you :)
Features
- Minimal dependencies. At this time, only sh, sed, awk and curl
- Minimal code (less than 50kb of code)
- Minimal runtime version to fit on different systems (openwrt, debian, ubuntu, ...)
- Modular. Zaf module can be maintained externaly from this framework
- Sharing code. Many zabbix external checks share common shell functions.
- Simplification of userparameter functions (does not have to be one-line long code)
- Zabbix discovery simplification. Creating zabbix item for discovery is not so easy in shell based system and result is not nice. But you can use framework function to do so.
- Zabbix agent autoinstallation and autoconfiguration suitable to use in puppet or another tool
- OS packaging support
- Zabbix API support
Installing Zaf
Note: this instructions are for trunk version of zaf. For stable version, see https://github.com/limosek/zaf/tree/1.3
You need to be root and you must have curl installed on your system. Depending on your system, github certificates may not be available so you have to use -k option for curl (insecure). Default installation type is silent. So there will be no questions and everything will be autodetected. This simple command should be used on most systems:
curl -k https://raw.githubusercontent.com/limosek/zaf/master/install.sh | sh
If you have only wget installed:
wget --no-check-certificate -O - https://raw.githubusercontent.com/limosek/zaf/master/install.sh | sh
If you do not have https support (like openwrt), I made small http mirror of github files which is synchronized each day:
wget -O - http://github.macura.cz/zaf/install.sh| ZAF_RAW_URL=http://github.macura.cz/zaf/ ZAF_REPO_URL=http://github.macura.cz/zaf-plugins/ sh
Install options and autoconfiguration
General parameters for install.sh on any system (simplest way how to install)
curl -k https://raw.githubusercontent.com/limosek/zaf/master/install.sh | \
sh -s {auto|interactive|debug-auto|debug-interactive} [Agent-Options] [Server-Options] [Zaf-Options]
or use git version:
git clone https://github.com/limosek/zaf.git; cd zaf; git checkout master
./install.sh {auto|interactive|debug-auto|debug-interactive} [Agent-Options] [Server-Options] [Zaf-Options]
Agent-Options: Z_Option=value [...]
Server-Options: S_Option=value [...]
Zaf-Options: ZAF_OPT=value [...]
To unset Agent-Option use Z_Option=''
So you can pass ANY configuration of your zabbix agent directly to installer prefixing it with Z_. Please note that options are Case Sensitive! Next to this, you can pass ANY zaf config options by ZAF_ prefix. You can see all interesting ZAF options if you use install interactive command. Interresting ZAF options:
| Option | Info | Default |
|---|---|---|
| ZAF_PKG | Packaging system to use | detect |
| ZAF_OS | Operating system to use | detect |
| ZAF_OS_CODENAME | Operating system codename | detect |
| ZAF_AGENT_PKG | Zabbix agent package | detect |
| ZAF_AGENT_OPTIONS | Zabbix options to set in cfg | empty |
| ZAF_GIT | Git is installed | detect |
| ZAF_CURL_INSECURE | Insecure curl (accept all certificates) | 1 |
| ZAF_TMP_DIR | Tmp directory | /tmp/ |
| ZAF_CACHE_DIR | Cache directory | /tmp/zafc |
| ZAF_LIB_DIR | Libraries directory | /usr/lib/zaf |
| ZAF_PLUGINS_DIR | Plugins directory | ${ZAF_LIB_DIR}/plugins |
| ZAF_PROXY | http[s] and ftp proxy used by zaf | empty |
| ZAF_REPO_URL | Plugins http[s] repository | https://raw.githubusercontent.com/limosek/zaf-plugins/master/ |
| ZAF_REPO_DIR | Plugins directory | ${ZAF_LIB_DIR}/repo |
| ZAF_AGENT_CONFIG | Zabbix agent config | /etc/zabbix/zabbix_agentd.conf |
| ZAF_AGENT_CONFIGD | Zabbix agent config.d | /etc/zabbix/zabbix_agentd.conf.d/ |
| ZAF_AGENT_BIN | Zabbix agent binary | /usr/sbin/zabbix_agentd |
| ZAF_AGENT_RESTART | Zabbix agent restart cmd | detect |
| ZAF_SERVER_CONFIG | Zabbix server config | /etc/zabbix/zabbix_server.conf |
| ZAF_SERVER_CONFIGD | Zabbix server config.d | /etc/zabbix/zabbix_server.conf.d/ |
| ZAF_SERVER_BIN | Zabbix server binary | /usr/sbin/zabbix_server |
| ZAF_SUDOERSD | Sudo sudoers.d directory | /etc/sudoers.d |
| ZAF_CROND | Cron.d directory | /etc/cron.d |
| ZAF_ZBXAPI_URL | Zabbix API url | http://localhost/zabbix/api_jsonrpc.php |
| ZAF_ZBXAPI_USER | Zabbix API user | zaf |
| ZAF_ZBXAPI_PASS | Zabbix API password | empty |
| ZAF_ZBXAPI_AUTHTYPE | Zabbix API authentication type | internal |
| ZAF_PLUGINS | Plugins to autoinstall | empty |
Installer will try to autoguess suitable config options for your system. Now everything was tested on Debian and OpenWrt. If somebody is interrested in, you can help and test with some rpm specific functions. Remember that on some systems, default zabbix agent config is empty so you need to enter essential config options as parameters.
Example
Suppose you want to autoinstall agent on clean system. You need only curl installed. Everything else is one-cmd process. This command will install zaf, install zabbix-agent if necessary and sets zabbix variables on agent to reach server. This command can be automatized by puppet or another deploying system.
curl -k https://raw.githubusercontent.com/limosek/zaf/master/install.sh | sh -s auto \
Z_Server=zabbix.server.local \
Z_ServerActive=zabbix.server.local \
Z_HostnameItem=system.hostname Z_RefreshActiveChecks=60 \
ZAF_REPO_GITURL="git://gitserver.local"
Packaged version
You can make your own deb package with preconfigured option. It is up to you to put it to right APT repository and install.
git clone https://github.com/limosek/zaf.git \
&& cd zaf \
&& git checkout master \
&& git clone https://github.com/limosek/zaf-plugins.git \
&& make deb PLUGINS="./zaf-plugins/fsx" ZAF_PLUGINS="zaf" ZAF_OPTIONS="ZAF_GIT=0" AGENT_OPTIONS="Z_Server=zabbix.server Z_ServerActive=zabbix.server Z_StartAgents=8"
sudo dpkg -i out/zaf-1.4master.deb
General usage:
make {deb|ipk|rpm} [ZAF_PLUGINS="plg1 [plg2]" [ZAF_OPTIONS="ZAF_cfg=val ..."] [AGENT_OPTIONS="Z_Server=host ..."]
ZAF_PLUGINS are embedded into package. Has to be local directories accessible during build.
Zaf plugin
Zaf plugin is set of configuration options and binaries which are needed for specific checks. For example, to monitor postfix, we need some cron job which is automaticaly run and next ti this, some external items which has to be configured. Do not mix zaf plugin and zabbix plugin. While zaf plugin is set of scripts or binaries external to zabbix agent, zabbix plugin is internal zabbix lodadable module.
Control file
Control file is main part of zaf plugin. It describes how to install plugin and defines all checks. In fact, simple control file can be enough to create zaf plugin because scripts can be embeded within. There are two kind of options: global and per item. Each option can be singleline:
Plugin: pluginname
or multiline:
Description::
Zaf plugin for monitoring fail2ban with LLD
Credits
2014 dron, jiri.slezka@slu.cz
2016 limo, lukas.macura@slu.cz
::
Items are enclosed like this:
Item some_item:
Description::
Returns number of currently banned IPs for jail
::
Parameters: jail
Cmd: sudo fail2ban-client status $1 | grep "Currently banned:" | grep -o -E "[0-9]*"
/Item
During plugin installation, zaf will check all dependencies, do install binaries and generates apropriate zabbix.conf.d entries. Look into https://github.com/limosek/zaf-plugins repository for more examples.
Zaf utility
Zaf binary can be installed on any system from openwrt to big system. It has minimal dependencies and is shell based. Is has minimal size (up to 50kb of code). It can be used for installing, removing and testing zaf plugin items. Zaf should be run as root.
./zaf
./zaf Version 1.4master. Please use some of this commands:
./zaf Cmd [ZAF_OPTION=value] [ZAF_CTRL_Option=value] [ZAF_CTRLI_Item_Option=value] ...
Plugin manipulation commands:
./zaf update To update repo (not plugins, similar to apt-get update)
./zaf upgrade To upgrade installed plugins from repo
./zaf install plugin To install plugin
./zaf remove plugin To remove plugin
Plugin info commands:
./zaf plugins To list installed plugins
./zaf show [plugin] To show installed plugins or plugin info
./zaf items [plugin] To list all suported items [for plugin]
Plugin diagnostic commands:
./zaf test [plugin[.item]] To test [all] suported items by zabbix_agentd [for plugin]
./zaf get [plugin[.item]] To test [all] suported items by zabbix_get [for plugin]
./zaf precache [plugin[.item]] To precache [all] suported items
Zabbix API commands:
./zaf api To zabbix API functions. See ./zaf api for more info.
Agent config info commands:
./zaf userparms See userparms generated from zaf on stdout
./zaf agent-config Reconfigure zabbix userparms in /etc/zabbix/zabbix_agentd.d
Zaf related commands:
./zaf self-upgrade To self-upgrade zaf
./zaf self-remove To self-remove zaf and its config
./zaf cache-clean To remove all entries from cache
Zaf can even communicate with zabbix server using its API. If you set ZAF_ZBXAPI_URL, ZAF_ZBXAPI_USER and ZAF_ZBXAPI_PASS in /etc/zaf.conf, you can use it:
./zaf api command [parameters]
get-host-id host Get host id
get-byid-host id [property] Get host property from id. Leave empty property for JSON
get-template-id template Get template id
get-byid-template id [property] Get template property from id. Leave empty property for JSON
get-map-id map Get map id
get-byid-map id [property] Get map property from id. Leave empty property for JSON
get-inventory host [fields] Get inventory fields [or all fields]
export-hosts dir [hg] Backup all hosts [in group hg] (get their config from zabbix and save to dir/hostname.xml)
export-host host Backup host (get config from zabbix to stdout)
import-template {plugin|file} Import template for plugin or from file
export-template name Export template to stdout
export-templates dir Export all templates to dir
Installing plugin
To install plugin from common repository. If git is available, local git repo is tried first. If not, remote https repo is tried second.
zaf install zaf
To install plugin from external source, external plugin has to be "zafable". This means that its maitainer will create control.zaf file located at http://some.project/plugin/control.zaf. Nothing else.
zaf install http://some.project/plugin
To install plugin from local directory:
zaf install /some/plugin
Installer will look into control file, run setup task defined there, fetch binaries and scripts needed for specific plugin and test system dependencies for that plugin. If everything is OK, zaf_plugin.conf is created in zabbix_agentd.d conf directory and userparameters are automaticaly added.
Plugin parameters
Plugin can have some global parameters. For example url of local server to check. See booked plugin. In that case, you have to specify parameters before use. To set parameters by environment:
zaf install booked ZAF_booked_url=http://booked.server/api ZAF_booked_username=user
To set parameters later:
zaf plugin-set booked url http://booked.server/api
zaf plugin-set booked username user
Plugin parameters are available as environment variables in shell script/binary run by agent. You can simulate this environment by
zaf itemsh booked.num_reservations
Interactive shell will be spawn and you can test your commands or scripts in same way how zabbix agent would do it. Use exit command or ctrl-D to get back.
How it works
Zaf installer will do most of actions needed to monitor some specific plugin items. Configuration of plugin is very simple and text readable. Anybody can write its own plugin or make its plugin "zafable". It is enough to create *control.zaf" file. For example, look into https://github.com/limosek/zaf-plugins repository. This is default repository for zaf.
I want to make my own plugin!
Great! Look into https://github.com/limosek/zaf-plugins repository, look to control files and try to create your own. It is easy! You can contact me for help.
I want to help with zaf!
Great! I have no time for testing on systems and writing system specific hacks. Next to this, templates should be optimized and tested for basic plugins.