问题描述
我有一个来自https://hub.docker.com/r/debezium/zookeeper:1.2映像和我的Compose文件的Zookeeper实例：
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
我可以看到Zookeeper服务器正常启动：
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
服务器日志显示：
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
但是我无法从主机连接到发布的端口：
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
当然，该端口已在防火墙中启用：
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)
我可以连接到正在运行的容器：
docker-exec debezium_zookeeper.1.app5h7goosa2cpn4g06azp2xt
并查看服务器状态：
[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
日志确实显示警告：
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
似乎是known issue。
这与我的封闭港口问题有关吗？
更新：我还尝试将hostname属性作为hostname: zookeeper添加到Compose文件中，并在127.0.1.1 zookeeper文件中添加/etc/hosts条目，但是将{{1} }命令仍显示关闭的端口。
解决方法
我不得不改变健康检查的方式。
healthcheck:
test: /zookeeper/bin/zkServer.sh print-cmd || exit 1
interval: 1m
timeout: 3s
retries: 3
start_period: 15s
完整的撰写文件：
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