问题
I have a running Zookeeper instance from the https://hub.docker.com/r/debezium/zookeeper:1.2 image and my Compose file:
version: "3.7"
services:
zookeeper:
image: debezium/zookeeper:1.2
ports:
- "2181:2181"
- "2888:2888"
- "3888:3888"
networks:
common:
volumes:
- "~/dev/docker/projects/debezium/volumes/zookeeper/data:/zookeeper/data"
- "~/dev/docker/projects/debezium/volumes/zookeeper/txns:/zookeeper/txns"
- "~/dev/docker/projects/debezium/volumes/zookeeper/conf:/zookeeper/conf"
- "~/dev/docker/projects/debezium/volumes/zookeeper/logs:/zookeeper/logs"
environment:
HOST_USER_ID: ${CURRENT_UID}
HOST_GROUP_ID: ${CURRENT_GID}
deploy:
replicas: 1
restart_policy:
condition: any
delay: 5s
max_attempts: 3
window: 10s
healthcheck:
test: curl --fail http://localhost:2181 || exit 1
interval: 1m
timeout: 3s
retries: 3
I can see the Zookeeper server start all right:
5f7860484b48 debezium/zookeeper:1.2 "/docker-entrypoint.…" About a minute ago Up About a minute (health
: starting) 2181/tcp, 2888/tcp, 3888/tcp, 8778/tcp, 9779/tcp debezium_zookeeper.1.hmdxswlsmqdebqkqvkjqzxnlc
with the server log showing:
debezium_zookeeper.1.j841dv1adeab@stephane-pc | 2020-10-12 08:45:15,032 - INFO [main:ContextHandler@825] - Started o.e.j.s.ServletContextHandler@3f197a46{/,null,AVAILABLE}
debezium_zookeeper.1.j841dv1adeab@stephane-pc | 2020-10-12 08:45:15,111 - INFO [main:AbstractConnector@330] - Started ServerConnector@4278a03f{HTTP/1.1,[http/1.1]}{0.0.0.0:8080}
debezium_zookeeper.1.j841dv1adeab@stephane-pc | 2020-10-12 08:45:15,112 - INFO [main:Server@399] - Started @5046ms
debezium_zookeeper.1.j841dv1adeab@stephane-pc | 2020-10-12 08:45:15,113 - INFO [main:JettyAdminServer@112] - Started AdminServer on address 0.0.0.0, port 8080 and command URL /commands
debezium_zookeeper.1.j841dv1adeab@stephane-pc | 2020-10-12 08:45:15,135 - INFO [main:ServerCnxnFactory@135] - Using org.apache.zookeeper.server.NIOServerCnxnFactory as server connection factory
debezium_zookeeper.1.j841dv1adeab@stephane-pc | 2020-10-12 08:45:15,145 - INFO [main:NIOServerCnxnFactory@673] - Configuring NIO connection handler with 10s sessionless connection timeout, 1 selector thread(s), 8 worker threads, and 64 kB direct buffers.
debezium_zookeeper.1.j841dv1adeab@stephane-pc | 2020-10-12 08:45:15,150 - INFO [main:NIOServerCnxnFactory@686] - binding to port 0.0.0.0/0.0.0.0:2181
debezium_zookeeper.1.j841dv1adeab@stephane-pc | 2020-10-12 08:45:15,224 - INFO [main:ZKDatabase@117] - zookeeper.snapshotSizeFactor = 0.33
debezium_zookeeper.1.j841dv1adeab@stephane-pc | 2020-10-12 08:45:15,320 - INFO [main:FileSnap@83] - Reading snapshot /zookeeper/data/version-2/snapshot.0
debezium_zookeeper.1.j841dv1adeab@stephane-pc | 2020-10-12 08:45:15,340 - INFO [main:FileTxnSnapLog@404] - Snapshotting: 0x0 to /zookeeper/data/version-2/snapshot.0
debezium_zookeeper.1.j841dv1adeab@stephane-pc | 2020-10-12 08:45:15,408 - INFO [main:ContainerManager@64] - Using checkIntervalMs=60000 maxPerMinute=10000
debezium_zookeeper.1.j841dv1adeab@stephane-pc | 2020-10-12 08:46:10,244 - WARN [NIOWorkerThread-1:NIOServerCnxn@370] - Exception causing close of session 0x0: Len error 1195725856
debezium_zookeeper.1.j841dv1adeab@stephane-pc | 2020-10-12 08:47:10,884 - WARN [NIOWorkerThread-2:NIOServerCnxn@370] - Exception causing close of session 0x0: Len error 1195725856
debezium_zookeeper.1.j841dv1adeab@stephane-pc | 2020-10-12 08:48:12,599 - WARN [NIOWorkerThread-3:NIOServerCnxn@370] - Exception causing close of session 0x0: Len error 1195725856
But I can't connect to the published port from the host:
stephane@stephane-pc:~$ nmap -p 2181 localhost
Starting Nmap 7.80 ( https://nmap.org ) at 2020-10-12 10:50 CEST
Nmap scan report for localhost (127.0.0.1)
Host is up (0.00033s latency).
PORT STATE SERVICE
2181/tcp closed eforward
Of course, the port is enabled in the firewall:
sudo ufw allow from any to any port 2181;
stephane@stephane-pc:~$ sudo ufw status verbose
Status: active
Logging: on (low)
Default: deny (incoming), allow (outgoing), deny (routed)
New profiles: skip
To Action From
-- ------ ----
8500 ALLOW IN 127.0.0.0
8500 ALLOW IN Anywhere
18630 ALLOW IN Anywhere
2181 ALLOW IN 127.0.0.0
2181 ALLOW IN Anywhere
9092 ALLOW IN Anywhere
8500 (v6) ALLOW IN Anywhere (v6)
18630 (v6) ALLOW IN Anywhere (v6)
2181 (v6) ALLOW IN Anywhere (v6)
9092 (v6) ALLOW IN Anywhere (v6)
I can connect to the running container:
docker-exec debezium_zookeeper.1.app5h7goosa2cpn4g06azp2xt
and see the server status:
[zookeeper@2f57d1a84ce7 ~]$ bin/zkServer.sh status
ZooKeeper JMX enabled by default
Using config: /zookeeper/bin/../conf/zoo.cfg
Client port found: 2181. Client address: localhost.
Mode: standalone
The log does show a warning though:
debezium_zookeeper.1.u0koxm2njw2i@stephane-pc | 2020-10-12 09:03:47,829 - WARN [NIOWorkerThread-2:NIOServerCnxn@370] - Exception causing close of session 0x0: Len error 1195725856
which seems to be a known issue.
Could this be related to my closed port issue ?
UPDATE: I also tried adding a hostname property as hostname: zookeeper to the Compose file and add the 127.0.1.1 zookeeper entry in the /etc/hosts file, but the nmap -p 2181 zookeeper command still showed a closed port.
回答1:
I had to change the way I check for health.
healthcheck:
test: /zookeeper/bin/zkServer.sh print-cmd || exit 1
interval: 1m
timeout: 3s
retries: 3
start_period: 15s
The complete Compose file:
version: "3.7"
services:
zookeeper:
image: debezium/zookeeper:1.2
ports:
- "2181:2181"
- "2888:2888"
- "3888:3888"
networks:
common:
volumes:
- "~/dev/docker/projects/debezium/volumes/zookeeper/data:/zookeeper/data"
- "~/dev/docker/projects/debezium/volumes/zookeeper/txns:/zookeeper/txns"
- "~/dev/docker/projects/debezium/volumes/zookeeper/conf:/zookeeper/conf"
- "~/dev/docker/projects/debezium/volumes/zookeeper/logs:/zookeeper/logs"
environment:
HOST_USER_ID: ${CURRENT_UID}
HOST_GROUP_ID: ${CURRENT_GID}
deploy:
resources:
limits:
cpus: "0.1"
memory: 256M
replicas: 1
restart_policy:
condition: any
delay: 5s
max_attempts: 3
window: 10s
healthcheck:
test: /zookeeper/bin/zkServer.sh print-cmd || exit 1
interval: 1m
timeout: 3s
retries: 3
start_period: 15s
kafka:
image: debezium/kafka:1.2
ports:
- "9092:9092"
networks:
common:
volumes:
- "~/dev/docker/projects/debezium/volumes/kafka/data:/kafka/data"
- "~/dev/docker/projects/debezium/volumes/kafka/logs:/kafka/logs"
environment:
ZOOKEEPER_CONNECT: zookeeper:2181
HOST_USER_ID: ${CURRENT_UID}
HOST_GROUP_ID: ${CURRENT_GID}
depends_on:
- zookeeper
deploy:
replicas: 1
restart_policy:
condition: any
delay: 5s
max_attempts: 3
window: 10s
healthcheck:
test: /kafka/bin/kafka-topics.sh --list --zookeeper zookeeper:2181 || exit 1
interval: 1m
timeout: 15s
retries: 3
start_period: 15s
networks:
common:
external: true
name: common
来源：https://stackoverflow.com/questions/64314622/debezium-zookeeper-port-2181-closed