[英]Healthcheck not working at all when using docker-compose (My service do not wait for Kafka to be started before launching)
我的 docker-compose 上有三項服務:
version: '3.4'
setup-topics:
image: 'bitnami/kafka:2'
hostname: setup-topics
container_name: setup-topics
command: "bash -c 'echo Waiting for Kafka to be ready... && \
./opt/bitnami/kafka/bin/kafka-topics.sh --create --if-not-exists --zookeeper zookeeper:2181 --partitions 1 --replication-factor 1 --topic orders && \
./opt/bitnami/kafka/bin/kafka-topics.sh --create --if-not-exists --zookeeper zookeeper:2181 --partitions 1 --replication-factor 1 --topic redis'"
environment:
KAFKA_BROKER_ID: ignored
KAFKA_ZOOKEEPER_CONNECT: ignored
depends_on:
- kafka
kafka:
container_name: kafka
hostname: kafka
image: 'bitnami/kafka:2'
ports:
- '9092:9092'
- '29092:29092'
volumes:
- 'kafka_data:/opt/kafka'
- './Ping.jar:/Ping.jar'
environment:
- KAFKA_HEAP_OPTS=-Xms1g -Xmx1g
- KAFKA_JVM_PERFORMANCE_OPTS=-Xms512m -Xmx512M
- KAFKA_BROKER_ID:1
- KAFKA_CFG_ZOOKEEPER_CONNECT=zookeeper-server:2181
- ALLOW_PLAINTEXT_LISTENER=yes
- KAFKA_CFG_LISTENER_SECURITY_PROTOCOL_MAP=PLAINTEXT:PLAINTEXT,PLAINTEXT_HOST:PLAINTEXT
- KAFKA_CFG_LISTENERS=PLAINTEXT://:9092,PLAINTEXT_HOST://:29092
- KAFKA_CFG_ADVERTISED_LISTENERS=PLAINTEXT://kafka-server:9092,PLAINTEXT_HOST://localhost:29092
depends_on:
- zookeeper
healthcheck:
test: ["CMD", "java", "-jar", "/Ping.jar", "localhost", "9092"]
interval: 30s
timeout: 10s
retries: 4
zookeeper:
container_name: zookeeper
hostname: zookeeper
image: 'bitnami/zookeeper:3'
ports:
- '2181:2181'
volumes:
- 'zookeeper_data:/bitnami'
environment:
- ALLOW_ANONYMOUS_LOGIN=yes
- ZOOKEEPER_CLIENT_PORT=32181
- ZOOKEEPER_TICK_TIME=2000
這里是 Ping.java 文件(在 stackoverflow 上找到它的答案: Docker-Compose: How to healthcheck OpenJDK:8 container? ):
import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.Socket;
public class Ping {
public static void main(String[] args) {
if (args.length != 2) {
System.exit(-1);
}
String host = args[0];
int port = 0;
try {
port = Integer.parseInt(args[1]);
} catch (NumberFormatException e) {
e.printStackTrace();
System.exit(-2);
}
try (Socket socket = new Socket()) {
socket.connect(new InetSocketAddress(host, port), 10 * 1000);
System.exit(0);
} catch (IOException e) {
System.exit(1);
}
}
}
即使SETUP-TOPICS
服務上的depends_on
依賴於 Kafka 才能工作,但他不會等到 Kafka 啟動后再運行並安裝新主題。
我可以使用以下方法避免此步驟:
KAFKA_AUTO_CREATE_TOPICS_ENABLE=true
但是出於我的開發目的,我需要將其設為 FALSE 並一一創建。
最重要的是,我已經在 Healthcheck 中使用此命令進行了測試,無需第三方文件:
healthcheck:
test: ["CMD", "bash", "-c", "unset" , "JMX_PORT" ,";" ,"/opt/bitnami/kafka/bin/kafka-topics.sh","--zookeeper","zookeeper:2181","--list"]
interval: 30s
timeout: 10s
retries: 4
最后,這是我兩次嘗試都收到的錯誤消息:
Waiting for Kafka to be ready...
Error while executing topic command : Replication factor: 1 larger than available brokers: 0.
[2020-06-01 15:06:28,809] ERROR org.apache.kafka.common.errors.InvalidReplicationFactorException: Replication factor: 1 larger than available brokers: 0.
(kafka.admin.TopicCommand$)
我知道我們也可以使用SLEEP
命令來做到這一點,但它不專業,如果服務器上出現性能問題並且 Kafka 需要更長的時間來啟動,這將被錯過並再次收到與上述相同的錯誤。
我也聽說過kafkacat
(我還沒有找到一個關於如何為此目的將它與 docker-compose 集成的示例)。
我想保持基本並使用有限的第三方工具來實現這個目標,這是我選擇 JAVA 文件的方式,因為圖像已經安裝了 Java 依賴項。
Hpe您理解我的觀點,提前感謝您的幫助。
不清楚為什么需要 JAR 文件。 這應該也可以
test: ["CMD", "nc", "-vz", "localhost", "9092"]
問題只是waiting for kafka
在運行命令之前等待的時間不夠長。 depends_on
不等待healthcheck
,AFAIK
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