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configmap.yaml
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apiVersion: v1
kind: ConfigMap
metadata:
name: gen-conf
data:
genconf-sentinel: |
#!/usr/bin/env python3
import time
import os
import subprocess
import threading
from kubernetes import client, config, watch
from redis.sentinel import Redis, Sentinel
f = open("/etc/redis/sentinel.conf", "w")
f.write("port 26379\n")
f.close()
def monitor_new_master(name, ip):
"waiting for the sentinel to start"
cli = "redis-cli -p 26379 "
cmd_list = ["sentinel monitor {} {} 6379 2".format(name, ip),
"sentinel set {} down-after-milliseconds 1000".format(name),
"sentinel flushconfig"
]
for cmd in cmd_list:
subprocess.run((cli + cmd).split(" "))
config.load_incluster_config()
v1 = client.CoreV1Api()
appsV1 = client.AppsV1Api()
sentinels = []
pods_sentinel = appsV1.read_namespaced_stateful_set(name = "sentinel", namespace = "redis-sentinel")
for i in range(pods_sentinel.spec.replicas):
sentinels.append(("sentinel-{}.sentinel-hs.redis-sentinel.svc.cluster.local".format(i), 26379))
print(sentinels)
masters = {}
for s in sentinels:
try:
sc = Redis(*s, socket_timeout=5)
masters = sc.sentinel_masters()
print("got master:", masters)
except Exception as e:
print("error get masters from {}. ".format(s), e)
continue
break
if masters:
for master in masters.keys():
name = masters[master]["name"]
ip = masters[master]["ip"]
down_after_milliseconds = masters[master]["down-after-milliseconds"]
r = Redis("localhost", 26379)
while True:
try:
r.ping()
except:
continue
break
monitor_new_master(name, ip)
genconf-redis: |
#!/usr/bin/env python3
import time
import os
import subprocess
import threading
from kubernetes import client, config, watch
from redis.sentinel import Redis, Sentinel
pod_is_slave = False
config.load_incluster_config()
v1 = client.CoreV1Api()
appsV1 = client.AppsV1Api()
def monitor_new_master(name, ip):
"waiting for the sentinel to start"
#如果是第一次启动，启动前要确保sentinel都启动完成
while True:
sentinels = appsV1.read_namespaced_stateful_set(name = "sentinel", namespace = "redis-sentinel")
if sentinels.status.ready_replicas == sentinels.spec.replicas:
break
time.sleep(1)
#保证redis也都启动完成，其实没必要？
while True:
redises = appsV1.read_namespaced_stateful_set(name = name, namespace = "redis-sentinel")
if redises.status.ready_replicas == redises.spec.replicas:
break
time.sleep(1)
#需要让每一个sentinel都监控
sentinels = appsV1.read_namespaced_stateful_set(name = "sentinel", namespace = "redis-sentinel")
for i in range(sentinels.spec.replicas):
cli = "redis-cli -h sentinel-{}.sentinel-hs.redis-sentinel.svc.cluster.local -p 26379 ".format(i)
cmd_list = ["sentinel monitor {} {} 6379 2".format(name, ip),
"sentinel set {} down-after-milliseconds 1000".format(name),
"sentinel flushconfig"
]
for cmd in cmd_list:
subprocess.run((cli + cmd).split(" "))
def sentinel_reset_master(master):
sentinels = appsV1.read_namespaced_stateful_set(name = "sentinel", namespace = "redis-sentinel")
for i in range(sentinels.spec.replicas):
cli = "redis-cli -h sentinel-{}.sentinel-hs.redis-sentinel.svc.cluster.local -p 26379 ".format(i)
subprocess.run((cli + "sentinel reset {}".format(master)).split(" "))
def try_ping(c, t):
n = t
while n > 0:
try:
c.ping()
except:
time.sleep(1)
n -= 1
print("retring ping the redis server", n)
continue
break
pod_name = os.getenv("HOSTNAME")
pod_ip = os.getenv("POD_IP")
f = open("/etc/redis/redis.conf", "w")
hostnum = int(pod_name.split("-")[-1])
f.write("port 6379\n")
statefulsetname = "-".join(pod_name.split("-")[:-1])
first_pod = v1.read_namespaced_pod(namespace="redis-sentinel", name=statefulsetname+"-0")
print("first pod ip: ", first_pod.status.pod_ip)
redis_servers = []
#因为第一次启动时以第0个pod作为master，因此后面的启动一定不能进入那里，一定要从这里得到master
#但是如果直接获取，时机不对的话，（比如master刚刚挂掉，或者还没有选出master），则不能得到正确的master
#所以，需要一直等
sentinels = []
pods_sentinel = appsV1.read_namespaced_stateful_set(name = "sentinel", namespace = "redis-sentinel")
for i in range(pods_sentinel.spec.replicas):
sentinels.append(("sentinel-{}.sentinel-hs.redis-sentinel.svc.cluster.local".format(i), 26379))
masters = {}
for s in sentinels:
try:
sc = Redis(*s, socket_timeout=5)
masters = sc.sentinel_masters()
except Exception as e:
print("error get masters from {}. ".format(s), e)
continue
break
sentinel = Sentinel(sentinels, socket_timeout=1)
if masters:
print("masters monitored: ", masters)
n = 0
while True:
try:
current_master = sentinel.discover_master(statefulsetname)
print("current master: ", current_master)
master_ip = current_master[0]
except Exception as e:
print("discover master error: ", e)
time.sleep(1)
n += 1
print("waiting for master, retry {} times".format(n))
continue
break
sentinel_reset_master(statefulsetname)
f.write("slaveof {} 6379\n".format(master_ip))
else:
print("no master monitored now")
#第一次启动时，都作为0号pod的replica
if not pod_name.endswith("-0"):
master_ip = first_pod.status.pod_ip
r = Redis(master_ip, 6379)
try_ping(r, 20)
f.write("slaveof {} 6379\n".format(master_ip))
else:
thread = threading.Thread(target=monitor_new_master, args=(statefulsetname, pod_ip))
thread.start()
f.write("protected-mode no\n")
f.write("appendonly yes\n")
f.write("bind 0.0.0.0\n")
f.close()