设置为在docker容器中运行的脚本也在主机上运行

Question

所以我想做的是使用"COPY script.sh script.sh"；(将脚本从hos复制到容器并执行(，但当在容器中执行脚本时，该脚本似乎也在主机上执行。

以下是Dockerfile:

FROM almalinux/almalinux:latest

RUN mkdir /opt/confluent 
RUN mkdir /opt/confluent-hub
#Confluent Home
ENV CONFLUENT_HOME=/opt/confluent
ENV KAFKA_CONFIG=$KAFKA_CONFIG
ENV ZOOKEEPER_CONFIG=$ZOOKEEPER_CONFIG
ENV SCHEMA_REGISTRY_CONFIG=$ZOOKEEPER_CONFIG
ENV CONNECT_CONFIG=$CONNECT_CONFIG
# Zookeeper
ENV ZOOKEEPER_DATA_DIR=$ZOOKEEPER_DATA_DIR
ENV ZOOKEEPER_CLIENT_PORT=$ZOOKEEPER_CLIENT_PORT
#Kafka
ENV BOOTSTRAP_SERVERS=$BOOTSTRAP_SERVERS
ENV KAFKA_SERVER_BROKER_ID=$KAFKA_SERVER_BROKER_ID
ENV ZOOKEEPER_CONNECT_IP_PORT=$ZOOKEEPER_CONNECT_IP_PORT
ENV KAFKA_SERVER_LOG_DIR=$KAFKA_SERVER_LOG_DIR
# schmea registry
ENV KAFKASTORE_TOPIC=$KAFKASTORE_TOPIC
ENV PROTOCOL_BOOTSTRAP_SERVERS=$PROTOCOL_BOOTSTRAP_SERVERS
ENV SCHEMA_REGISTRY_GROUP_ID=$SCHEMA_REGISTRY_GROUP_ID
ENV SCHEMA_REGISTRY_LEADER_ELIGIBILITY=$SCHEMA_REGISTRY_LEADER_ELIGIBILITY
# Kafka connect
ENV CONNECT_REST_PORT=$CONNECT_REST_PORT
ENV CONNECT_OFFSETS=$CONNECT_OFFSETS
ENV CONNECT_KEY_CONVERTER=$CONNECT_KEY_CONVERTER
ENV SCHEMA_REGISTRY_URL=$SCHEMA_REGISTRY_URL
ENV CONNECT_VALUE_CONVERTER=$CONNECT_VALUE_CONVERTER
ENV SCHEMA_REGISTRY_LISTENER=$SCHEMA_REGISTRY_LISTENER
ENV CONNECT_PLUGIN_PATH=/usr/share/java/,$CONFLUENT_HOME/share/confluent-hub-components/

# install openjdk8
RUN dnf update -y && dnf install epel-release  -y
RUN dnf install wget zip moreutils gettext unzip java-1.8.0-openjdk.x86_64 -y
# install conflunet
WORKDIR $CONFLUENT_HOME
RUN wget https://packages.confluent.io/archive/6.1/confluent-community-6.1.1.tar.gz -P .
RUN tar -xvzf confluent-community-6.1.1.tar.gz
RUN mv confluent-6.1.1/* .
RUn rm -rf confluent-6.1.1 confluent-community-6.1.1.tar.gz
# install confluent hub
RUN wget http://client.hub.confluent.io/confluent-hub-client-latest.tar.gz -P /opt/confluent-hub
WORKDIR /opt/confluent-hub 
RUN tar -xvzf confluent-hub-client-latest.tar.gz 
RUN rm -rf confluent-hub-client-latest.tar.gz
ENV CONFLUENT_HUB /opt/confluent-hub/bin
# Export path
ENV PATH $PATH:$CONFLUENT_HOME:$CONFLUENT_HUB
# install jdbc connector
COPY confluentinc-kafka-connect-jdbc-10.1.0.zip $CONFLUENT_HOME/share/confluent-hub-components/
RUN unzip $CONFLUENT_HOME/share/confluent-hub-components/confluentinc-kafka-connect-jdbc-10.1.0.zip
RUN rm -rf confluentinc-kafka-connect-jdbc-10.1.0.zip
# Copy confleunt config to docker
WORKDIR $CONFLUENT_HOME
COPY config/* config/
# startup
COPY startup.sh ./startup.sh
RUN chmod +x ./startup.sh
CMD ./startup.sh

下面是startup.sh，它将替换配置文件中的环境变量并启动kafka服务，但当在容器中运行时，该脚本将替换主机配置文件上的值：

#!/bin/bash
# Substitue environment variables in actual $CONFLUENT_HOME/configs
envsubst  < $CONFLUENT_HOME/config/zookeeper.properties | sponge $CONFLUENT_HOME/config/zookeeper.properties
envsubst  < $CONFLUENT_HOME/config/server.properties | sponge $CONFLUENT_HOME/config/server.properties
envsubst  < $CONFLUENT_HOME/config/schema-registry.properties | sponge $CONFLUENT_HOME/config/schema-registry.properties
envsubst  < $CONFLUENT_HOME/config/connect-avro-standalone.properties | sponge $CONFLUENT_HOME/config/connect-avro-standalone.properties
# start zookeeper
$CONFLUENT_HOME/bin/zookeeper-server-start -daemon $ZOOKEEPER_CONFIG
sleep 2
# start kafka broker
$CONFLUENT_HOME/bin/kafka-server-start -daemon $KAFKA_CONFIG
sleep 2
# start schema registry
$CONFLUENT_HOME/bin/schema-registry-start -daemon $SCHEMA_REGISTRY_CONFIG
sleep 2
# start kafka connect
$CONFLUENT_HOME/bin/connect-standalone -daemon $CONNECT_CONFIG $CONFLUENT_HOME/etc/kafka/connect-file-sink.properties
sleep 2
while :
do
echo "Confluent Running "
sleep 5
done

码头工人组成：

version : "3.9"
services:
confluent-community:
build: ./
environment:
- KAFKA_CONFIG=$CONFLUENT_HOME/config/server.properties
- ZOOKEEPER_CONFIG=$CONFLUENT_HOME/config/zookeeper.properties
- SCHEMA_REGISTRY_CONFIG=$CONFLUENT_HOME/config/schema-registry.properties
- CONNECT_CONFIG=$CONFLUENT_HOME/config/connect-avro-standalone.properties
- CONNECT_REST_PORT=8083
- CONNECT_OFFSETS=$CONFLUENT_HOME/data/connect/connect.offsets
- CONNECT_KEY_CONVERTER=io.confluent.connect.avro.AvroConverter
- SCHEMA_REGISTRY_URL=http://localhost:8081
- CONNECT_VALUE_CONVERTER=io.confluent.connect.avro.AvroConverter
- SCHEMA_REGISTRY_LISTENER=http://0.0.0.0:8081
- KAFKASTORE_TOPIC=_schemas
- SCHEMA_REGISTRY_GROUP_ID=SCHEMA_REGISTRY_A
- SCHEMA_REGISTRY_LEADER_ELIGIBILITY=true
- PROTOCOL_BOOTSTRAP_SERVERS=PLAINTEXT://localhost:9092
- ZOOKEEPER_DATA_DIR=$CONFLUENT_HOME/data/zookeeper
- ZOOKEEPER_CLIENT_PORT=2181
- BOOTSTRAP_SERVERS=localhost:9092
- KAFKA_SERVER_BROKER_ID=0
- ZOOKEEPER_CONNECT_IP_PORT=localhost:2181
- KAFKA_SERVER_LOG_DIR=$CONFLUENT_HOME/data/kafka-logs
# ports:
#- "9092:9092"
# - "8081:8081"
#- "8083:8083"
network_mode: "host"

volumes:
- ~/Documents/confluent/docker-logs:/opt/confluent/logs
- ~/Documents/confluent/config:/opt/confluent/config
- ~/Documents/confluent/docker-data:/opt/confluent/data

Answer 1

当您将装载配置文件绑定到容器中时

volumes:
- ~/Documents/confluent/config:/opt/confluent/config

容器中的文件是主机上的文件。当启动脚本使用envsubst重写配置文件时，容器中没有单独的副本，因此它也会重写主机上的文件。

如果您使用单独的目录：

volumes:
- ~/Documents/confluent/config:/opt/confluent/config-templates

然后，您的脚本可以读取该目录中的文件，并写入非卷目录：

for f in "$CONFLUENT_HOME/config-templates/*"; do
ff=$(basename "$f")
envsubst <$f >"$CONFLUENT_HOME/config/$ff"
done

(在四个独立的容器中运行四个进程，而不使用-daemon选项，因此它们是各自容器中的单个前台进程。您不需要配置任何文件系统路径或在运行时注入它们；例如，*_CONFIG环境变量可以安全地保留为其默认值，或者如果必须设置，则仅在Dockerfile中设置它们(.