zabbix/zabbix-replicator
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Stefan Heykes 2019-06-25 16:23:20 +02:00
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README.md
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# zabbix-replicator # zabbix-replicator
This repository contains a python-based replication tool for Zabbix Servers This repository contains a python-based replication tool for Zabbix Servers
It needs a config file (example in this repository) and is intented to be run
as a cron job.
Using multiple configurations is supported and possible.

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example-config.json Normal file
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{
"primary": {
"url": "http://server1",
"user": "zbxapi_readonly",
"password": "zabbix"
},
"replica": {
"url": "http://server2",
"user": "zbxapi_write",
"password": "zabbix",
"ip": "127.0.0.1",
"port": "10051"
},
"groups": [{"groupid": "2"}],
"interfaces": [{
"type": "1",
"main": "1",
"useip": "1",
"ip": "127.0.0.1",
"dns": "",
"port": "10050"
}],
"timestamp_item": {
"key_": "replication.timestamp",
"name": "replication.timestamp",
"type": 2,
"value_type": 3,
"description": "This item holds the timestamp for the Zabbix Server-Server Replication",
"history": "7d",
"status": 0,
"trends": "7d"
},
"timestamp_trigger": {
"comments": "This trigger exists to monitor if the server-server replication is working",
"description": "No Zabbix Replication Data received for {HOST.NAME}",
"expression": "{HOSTNAME:replication.timestamp.nodata(300s)}=1",
"priority": 4,
"status": 0,
"type": 0,
"recovery_mode": 0,
"recovery_expression": "",
"correlation_mode": 0,
"manual_close": 0
},
"replication_hosts": [
"examplehost"
],
"initial_history": 86400,
"map_dir": "/var/lib/zabbix/replica"
}

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replicate-data.py Executable file
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#!/bin/python
# -*- coding: utf-8 -*-
"""
Replicating Data from one Zabbix server to another
This script should run as a cronjob every minute or however you like.
It uses flock to make sure that only one instance is running at a time,
so it still works fine when it sometimes need a long time to replicate after
adding hosts or connection outages.
It replicates item+trigger configs and the item data from one zabbix
server (the primary) to another one (the replica).
It requests the config/data via the Zabbix API (so needs a user/login
who has the necessary read rights etc) and writes the config also
via API (needing a write user on that one), while using the Zabbix
Sender Protocol for the data replication into the replica
The hostnames to be replicated must be configured in a json config file,
it then tries to replicate all items and triggers of it. Configuration
replication is done if it was not possible to send all data successfully
(thus assuming missing items on the replica as the cause).
It adds a replication.timestamp item to keep track of when the replication
was done successfully the last time. This script also provides a trigger
for this item and makes all replicated triggers dependent on this.
All replicated items are configured as "Zabbix Trapper Items" in the replica
to make it possible to use the Zabbix Sender Protocol for them.
"""
import argparse
import fcntl
import json
import pprint
import os
import sys
import time
from pyzabbix import ZabbixAPI
from pyzabbix import ZabbixMetric
from pyzabbix import ZabbixSender
config_file = "/vagrant/replica/example-config.json"
def get_timestamp(zbx, hostname, config):
""" This method should get the timestamp of the last successful
replication of the given host. It must be checked if it exists already,
because if this is the first time a host shall be replicated, the host
is not yet created. In that case, the timestamp is used as defined by
the initial_time variable to start with data from a certain period """
now_time = int(time.time())
item = zbx.item.get(filter={
"host": hostname,
"name": config["timestamp_item"]["name"]})
if len(item) == 0:
# item is not yet existing, needs to be created and last time is 0
create_or_update_item(zbx, hostname, config["timestamp_item"], config)
# we only want to replace hostname in the copy
trigger = config["timestamp_trigger"].copy()
trigger["expression"] = trigger["expression"].replace("HOSTNAME",
hostname)
create_or_update_trigger(zbx, hostname, trigger)
last_time = now_time - config["initial_history"]
else:
itemid = item[0]['itemid']
history = zbx.history.get(itemids=itemid,
sortorder="DESC",
sortfield='clock',
limit=1)
if len(history) == 0:
# first replication - item exists, but did never receive any data
last_time = now_time - config["initial_history"]
else:
last_time = history[0]['value']
return last_time, now_time
def send_timestamp(sender, hostname, itemname, timestamp):
""" When the data was completely replicated, the timestamp of
the replication is send to the Zabbix replica """
metrics = []
m = ZabbixMetric(hostname, itemname, timestamp)
metrics.append(m)
sender.send(metrics)
def replicate_hostdata(primary,
replica,
sender,
hostname,
last_time,
now_time,
config):
""" This method replicates all data for one host in a given timeframe.
If it should not be possible to send all items, this method calls the
config replication to make it possible the next time """
print "INFO: Replicating Data for " + hostname
pp = pprint.PrettyPrinter(indent=4)
try:
with open(os.path.join(config["map_dir"],
hostname + ".json"),
"r") as f:
item_map = json.loads(f.read())
except:
# when no config exists for that host, create it new
item_map = replicate_hostconfig(primary, replica, hostname, config)
float_values = [key for key, val in item_map.items()
if val["valtype"] == "0"]
char_values = [key for key, val in item_map.items()
if val["valtype"] == "1"]
unsigned_values = [key for key, val in item_map.items()
if val["valtype"] == "3"]
text_values = [key for key, val in item_map.items()
if val["valtype"] == "4"]
metrics = []
if len(float_values) > 0:
item_history = primary.history.get(itemids=float_values,
time_from=last_time,
time_till=now_time,
history="0")
for metric in item_history:
m = ZabbixMetric(hostname,
item_map[metric["itemid"]]['key'],
metric['value'],
int(metric['clock']))
metrics.append(m)
if len(char_values) > 0:
item_history = primary.history.get(itemids=char_values,
time_from=last_time,
time_till=now_time,
history="1")
for metric in item_history:
m = ZabbixMetric(hostname,
item_map[metric["itemid"]]['key'],
metric['value'],
int(metric['clock']))
metrics.append(m)
if len(unsigned_values) > 0:
item_history = primary.history.get(itemids=unsigned_values,
time_from=last_time,
time_till=now_time,
history="3")
for metric in item_history:
m = ZabbixMetric(hostname,
item_map[metric["itemid"]]['key'],
metric['value'],
int(metric['clock']))
metrics.append(m)
if len(text_values) > 0:
item_history = primary.history.get(itemids=text_values,
time_from=last_time,
time_till=now_time,
history="4")
for metric in item_history:
m = ZabbixMetric(hostname,
item_map[metric["itemid"]]['key'],
metric['value'],
int(metric['clock']))
metrics.append(m)
response = sender.send(metrics)
pp.pprint(response)
if response.failed > 0:
print "WARN: Replication of Data not successful"
# sending of items failed
# try to update the config and try to send again
item_map = replicate_hostconfig(primary, replica, hostname, config)
else:
send_timestamp(sender,
hostname,
config["timestamp_item"]["name"],
now_time)
print "INFO: Replication of Data successful"
def replicate_hostconfig(primary, replica, hostname, config):
""" This method replicates item and trigger configs for the
given hostname from primary to replica server.
It converts all items to "Zabbix Trapper" type and additionally
adds a dependency to the replication trigger to all triggers"""
print "INFO: Replicating Config for " + hostname
items_raw = primary.item.get(filter={"host": hostname})
items = []
item_map = {}
for raw in items_raw:
clean = {
"key_": raw["key_"],
"name": raw["name"],
"type": 2,
"value_type": raw["value_type"],
"description": raw["description"],
"history": raw["history"],
"status": raw["status"],
"trends": raw["trends"]
}
items.append(clean)
item_map[raw["itemid"]] = {"key": raw["key_"],
"valtype": raw["value_type"]}
for item in items:
create_or_update_item(replica, hostname, item, config)
# replicate trigger configs
triggers_raw = primary.trigger.get(filter={"host": hostname},
expandExpression=True,
sortfield="triggerid",
selectDependencies="extend")
triggers = []
for raw in triggers_raw:
clean = {
"comments": raw["comments"],
"description": raw["description"],
"expression": raw["expression"],
"priority": raw["priority"],
"status": raw["status"],
"type": raw["type"],
"recovery_mode": raw["recovery_mode"],
"recovery_expression": raw["recovery_expression"],
"correlation_mode": raw["correlation_mode"],
"manual_close": raw["manual_close"]
}
clean["dep_names"] = [config["timestamp_trigger"]["description"]]
for dep in raw["dependencies"]:
clean["dep_names"].append(dep["description"])
triggers.append(clean)
for trigger in triggers:
r = create_or_update_trigger(replica, hostname, trigger)
with open(os.path.join(config["map_dir"], hostname + ".json"), "w") as f:
f.write(json.dumps(item_map))
return item_map
def create_host(replica, hostname, config):
""" This method simply creates a new host on the replica server """
host = {
"host": hostname,
"groups": config["groups"],
"interfaces": config["interfaces"]
}
replica.host.create(host)
def create_or_update_item(replica, hostname, item, config):
""" This method checks if an item already exists on the replica
and either creates or updates it as it is defined on the primary """
hostid = replica.get_id("host", hostname)
if hostid is None:
create_host(replica, hostname, config)
hostid = replica.get_id("host", hostname)
item["hostid"] = hostid
items_raw = replica.item.get(filter={"host": hostname,
"key_": item["key_"]})
if len(items_raw) == 0:
itemid = None
else:
itemid = items_raw[0]["itemid"]
pp = pprint.PrettyPrinter(indent=4)
if itemid is None:
print "Creating: " + item["key_"]
result = replica.item.create(item)
else:
print "Updating: " + item["key_"]
item["itemid"] = itemid
result = replica.item.update(item)
def create_or_update_trigger(replica, hostname, trigger):
""" This method checks if a trigger already exists on the replica
and either creates or updates it as it is defined on the primary """
result = replica.trigger.get(
filter={"host": hostname,
"description": trigger["description"]})
dep_ids = []
dependencies = trigger.pop("dep_names", [])
for dep in dependencies:
r = replica.trigger.get(filter={"host": hostname, "description": dep})
if len(r) == 1:
dep_ids.append({"triggerid": r[0]["triggerid"]})
trigger["dependencies"] = dep_ids
pp = pprint.PrettyPrinter(indent=4)
if len(result) == 1:
trigger["triggerid"] = result[0]["triggerid"]
print "Updating: " + trigger["description"]
pp.pprint(replica.trigger.update(trigger))
else:
print "Creating: " + trigger["description"]
pp.pprint(replica.trigger.create(trigger))
def zabbix_login(zabbixurl, user, password):
""" This method is reponsible for the login to zabbix """
zbx = ZabbixAPI(zabbixurl, user=user, password=password)
return zbx
def main():
# parse parameters
# create zabbix communication objects
parser = argparse.ArgumentParser()
parser.add_argument("config_file", help="replica configuration file")
parser.add_argument("-r",
"--replicate-config",
help=("Force a replication of the full item/trigger"
"configuration from one server to another"),
action="store_true")
args = parser.parse_args()
# load config from file
with open(args.config_file, "r") as f:
config = json.loads(f.read())
# make sure only one instance is running per config file
fh = open(os.path.realpath(__file__), 'r')
try:
fcntl.flock(fh, fcntl.LOCK_EX | fcntl.LOCK_NB)
except:
print "Already one instance running"
os._exit(0)
# get important values from config
primary = zabbix_login(config["primary"]["url"],
config["primary"]["user"],
config["primary"]["password"])
replica = zabbix_login(config["replica"]["url"],
config["replica"]["user"],
config["replica"]["password"])
sender = ZabbixSender(config["replica"]["ip"],
int(config["replica"]["port"]))
pp = pprint.PrettyPrinter(indent=4)
# explicitly perform config replication
if args.replicate_config:
for hostname in config["replication_hosts"]:
item_map = replicate_hostconfig(primary, replica, hostname, config)
pp.pprint(item_map)
# perform data replication and if necessary config replication
for hostname in config["replication_hosts"]:
last_time, now_time = get_timestamp(replica,
hostname,
config)
replicate_hostdata(primary,
replica,
sender,
hostname,
last_time,
now_time,
config)
if __name__ == "__main__":
main()