bash - Docker 上的 DataStax Enterprise : fails to start due to/hadoop/conf directory not being writable

Question

我关注了DataStax's guide on best practices for using DSE with Docker ，但我在使用 DataStax 提供的所有默认设置脚本和 Dockerfile 时遇到了以下错误。

错误日志

Caused by: java.lang.RuntimeException: Failed to save custom DSE Hadoop config
        at com.datastax.bdp.hadoop.mapred.CassandraJobConf.writeDseHadoopConfig(CassandraJobConf.java:310) ~[dse-hadoop-5.0.3.jar:5.0.3]
        at com.datastax.bdp.hadoop.mapred.CassandraJobConf.writeDseHadoopConfig(CassandraJobConf.java:174) ~[dse-hadoop-5.0.3.jar:5.0.3]
        at com.datastax.bdp.ConfigurationWriterPlugin.onActivate(ConfigurationWriterPlugin.java:20) ~[dse-hadoop-5.0.3.jar:5.0.3]
        at com.datastax.bdp.plugin.PluginManager.initialize(PluginManager.java:377) ~[dse-core-5.0.3.jar:5.0.3]
        at com.datastax.bdp.plugin.PluginManager.activateDirect(PluginManager.java:306) ~[dse-core-5.0.3.jar:5.0.3]
        ... 7 common frames omitted
Caused by: java.io.IOException: Directory not writable: /opt/dse/resources/hadoop/conf
        at com.datastax.bdp.hadoop.mapred.CassandraJobConf.saveConfiguration(CassandraJobConf.java:466) ~[dse-hadoop-5.0.3.jar:5.0.3]
        at com.datastax.bdp.hadoop.mapred.CassandraJobConf.saveDseHadoopConfiguration(CassandraJobConf.java:345) ~[dse-hadoop-5.0.3.jar:5.0.3]
        at com.datastax.bdp.hadoop.mapred.CassandraJobConf.writeDseHadoopConfig(CassandraJobConf.java:300) ~[dse-hadoop-5.0.3.jar:5.0.3]
        ... 11 common frames omitted
Unable to start DSE server: Unable to activate plugin com.datastax.bdp.ConfigurationWriterPlugin
com.datastax.bdp.plugin.PluginManager$PluginActivationException: Unable to activate plugin com.datastax.bdp.ConfigurationWriterPlugin
        at com.datastax.bdp.plugin.PluginManager.activateDirect(PluginManager.java:327)
        at com.datastax.bdp.plugin.PluginManager.activate(PluginManager.java:259)
        at com.datastax.bdp.plugin.PluginManager.activate(PluginManager.java:169)
        at com.datastax.bdp.plugin.PluginManager.preStart(PluginManager.java:77)
        at com.datastax.bdp.server.DseDaemon.preStart(DseDaemon.java:490)
        at com.datastax.bdp.server.DseDaemon.start(DseDaemon.java:462)
        at org.apache.cassandra.service.CassandraDaemon.activate(CassandraDaemon.java:583)
        at com.datastax.bdp.DseModule.main(DseModule.java:91)
Caused by: java.lang.RuntimeException: Failed to save custom DSE Hadoop config
        at com.datastax.bdp.hadoop.mapred.CassandraJobConf.writeDseHadoopConfig(CassandraJobConf.java:310)
        at com.datastax.bdp.hadoop.mapred.CassandraJobConf.writeDseHadoopConfig(CassandraJobConf.java:174)
        at com.datastax.bdp.ConfigurationWriterPlugin.onActivate(ConfigurationWriterPlugin.java:20)
        at com.datastax.bdp.plugin.PluginManager.initialize(PluginManager.java:377)
        at com.datastax.bdp.plugin.PluginManager.activateDirect(PluginManager.java:306)
        ... 7 more
Caused by: java.io.IOException: Directory not writable: /opt/dse/resources/hadoop/conf

错误非常简单，尝试通过在 Dockerfile 中添加一些额外的 chmod 调用来解决该问题，但无济于事。

Dockerfile

# Provided without any warranty, these files are intended
# to accompany the whitepaper about DSE on Docker and are
# not intended for production and are not actively maintained.

# Loosely based on docker-cassandra by the fine folk at Spotify
# -- https://github.com/spotify/docker-cassandra/
# Loosely based on cassandra-docker by the one and only Al Tobey
# -- https://github.com/tobert/cassandra-docker/

# base yourself on any ubuntu 14.04 image containing JDK8
# official Docker Java images are distributed with OpenJDK
# Datastax certifies its product releases specifically
# on the Oracle/Sun JVM, so YMMV with OpenJDK

FROM nimmis/java:oracle-8-jdk

# Avoid ERROR: invoke-rc.d: policy-rc.d denied execution of start.
RUN echo "#!/bin/sh\nexit 0" > /usr/sbin/policy-rc.d

RUN export DEBIAN_FRONTEND=noninteractive && \
    apt-get update && \
    apt-get -y install adduser \
    curl \
    lsb-base \
    procps \
    zlib1g \
    gzip \
    python \
    python-support \
    sysstat \
    ntp bash tree && \
    rm -rf /var/lib/apt/lists/*

# grab gosu for easy step-down from root
RUN curl -o /bin/gosu -SkL "https://github.com/tianon/gosu/releases/download/1.4/gosu-$(dpkg --print-architecture)" \
    && chmod +x /bin/gosu


# DSE tarball can be download into the folder where Dockerfile is
# wget --user=$USER --password=$PASS http://downloads.datastax.com/enterprise/dse-5.0.0-bin.tar.gz
# you may want to replace dse-5.0.0-bin.tar.gz with the corresponding downloaded package name. When
# downloaded, please remove the version number part of the filename (or create a symlink), so the
# resulting file is named dse-bin.tar.gz (that way the docker file itself remains version independent).
#
# DataStax Agent debian package can be downloaded from
# wget --user=$USER --password=$PASS http://debian.datastax.com/enterprise/pool/datastax-agent_6.0.0_all.deb
# you may want to replace the specific version with the corresponding downloaded package name. When
# downloaded, please remove the version number part of the filename (or create a symlink), so the
# resulting file is named datastax-agent_all.deb (that way the docker file itself remains version
# independent).
ADD dse.tar.gz /opt
ADD datastax-agent_all.deb /tmp

ENV DSE_HOME /opt/dse

RUN ln -s /opt/dse* $DSE_HOME

# keep data here
VOLUME /data

# and logs here
VOLUME /logs

VOLUME /opt/dse

# create a dedicated user for running DSE node
RUN groupadd -g 1337 cassandra && \
    useradd -u 1337 -g cassandra -s /bin/bash -d $DSE_HOME cassandra && \
    chown -R cassandra:cassandra /opt/dse* 

RUN chmod r+w -R /opt/dse/

# install the agent
RUN dpkg -i /tmp/datastax-agent_all.deb

# starting node using custom entrypoint that configures paths, interfaces, etc.
COPY scripts/dse-entrypoint /usr/local/bin/
RUN chmod +x /usr/local/bin/dse-entrypoint
ENTRYPOINT ["/usr/local/bin/dse-entrypoint"]

# Running any other DSE/C* command should be done on behalf dse user
# Perform that using a generic command laucher
COPY scripts/dse-cmd-launcher /usr/local/bin/
RUN chmod +x /usr/local/bin/dse-cmd-launcher

# link dse commands to the launcher
RUN for cmd in cqlsh dsetool nodetool dse cassandra-stress; do \
        ln -sf /usr/local/bin/dse-cmd-launcher /usr/local/bin/$cmd ; \
    done

# the detailed list of ports
# http://docs.datastax.com/en/datastax_enterprise/5.0/datastax_enterprise/sec/secConfFirePort.html

# Cassandra
EXPOSE 7000 9042 9160

# Solr
EXPOSE 8983 8984

# Spark
EXPOSE 4040 7080 7081 7077

# Hadoop
EXPOSE 8012 50030 50060 9290

# Hive/Shark
EXPOSE 10000

# Graph

可能有解决此问题答案的最后一个地方可能是用于在此容器启动时实际启动 DSE 的启动脚本。

DSE 启动脚本(启动时由 Docker 容器调用)

#!/bin/sh

# Provided without any warranty, these files are intended
# to accompany the whitepaper about DSE on Docker and are 
# not intended for production and are not actively maintained.

# Bind the various services
# These should be updated on every container start

if [ -z ${IP} ]; then
  IP=`hostname --ip-address`
fi

echo $IP > /data/ip.address

# create directories for holding the node's data, logs, etc.
create_dirs() {
  local base_dir=$1;

  mkdir -p $base_dir/data/commitlog
  mkdir -p $base_dir/data/saved_caches
  mkdir -p $base_dir/data/hints
  mkdir -p $base_dir/logs
}

# tweak the cassandra config
tweak_cassandra_config() {
  env="$1/cassandra-env.sh"
  conf="$1/cassandra.yaml"

  base_data_dir="/data"

  # Set the cluster name
  if [ -z "${CLUSTER_NAME}" ]; then
    printf " - No cluster name provided; skipping.\n"
  else
    printf " - Setting up the cluster name: ${CLUSTER_NAME}\n"
    regexp="s/Test Cluster/${CLUSTER_NAME}/g"
    sed -i -- "$regexp" $conf
  fi

  # Set the commitlog directory, and various other directories
  # These are done only once since the regexep matches will fail on subsequent
  # runs.
  printf " - Setting up directories\n"
  regexp="s|/var/lib/cassandra/|$base_data_dir/|g"
  sed -i -- "$regexp" $conf
  regexp="s/^listen_address:.*/listen_address: ${IP}/g"
  sed -i -- "$regexp" $conf
  regexp="s/rpc_address:.*/rpc_address: ${IP}/g"
  sed -i -- "$regexp" $conf

  # seeds
  if [ -z "${SEEDS}" ]; then
    printf " - Using own IP address ${IP} as seed.\n";
    regexp="s/seeds:.*/seeds: \"${IP}\"/g";
  else
    printf " - Using seeds: $SEEDS\n";
    regexp="s/seeds:.*/seeds: \"${IP},${SEEDS}\"/g"
  fi
  sed -i -- "$regexp" $conf

  # JMX
  echo "JVM_OPTS=\"\$JVM_OPTS -Djava.rmi.server.hostname=127.0.0.1\"" >> $env
}

tweak_dse_in_sh() {
  # point C* logs dir to the created volume
  sed -i -- "s|/var/log/cassandra|/logs|g" "$1/dse.in.sh"
}

tweak_spark_config() {
  sed -i -- "s|/var/lib/spark/|/data/spark/|g" "$1/spark-env.sh"
  sed -i -- "s|/var/log/spark/|/logs/spark/|g" "$1/spark-env.sh"
  mkdir -p /data/spark/worker
  mkdir -p /data/spark/rdd
  mkdir -p /logs/spark/worker
}

tweak_agent_config() {
  [ -d "/var/lib/datastax-agent" ] && cat > /var/lib/datastax-agent/conf/address.yaml <<EOF
stomp_interface: ${STOMP_INTERFACE}
use_ssl: 0
local_interface: ${IP}
hosts: ["${IP}"]
cassandra_install_location: /opt/dse
cassandra_log_location: /logs
EOF
  chown cassandra:cassandra /var/lib/datastax-agent/conf/address.yaml
}

setup_node() {
  printf "* Setting up node...\n"
  printf " + Setting up node...\n"

  create_dirs
  tweak_cassandra_config "$DSE_HOME/resources/cassandra/conf"
  tweak_dse_in_sh "$DSE_HOME/bin"
  tweak_spark_config "$DSE_HOME/resources/spark/conf"
  tweak_agent_config
  chown -R cassandra:cassandra /data /logs /conf

  # mark that we tweaked configs
  touch "$DSE_HOME/tweaked_configs"

  printf "Done.\n"
}

# if marker file doesn't exist, setup node
[ ! -f "$DSE_HOME/tweaked_configs" ] && setup_node

[ -f "/etc/init.d/datastax-agent" ] && /etc/init.d/datastax-agent start

exec gosu cassandra "$DSE_HOME/bin/dse" cassandra -f "$@"

Docker 容器命令行参数

这是我用来通过 Docker 启动单个 DSE 实例的命令行参数:

#!/bin/bash

# Used to start a single DSE node that has both Spark and Cassandra running on it
OPSC_CONTAINER=$1

if [ -z "$OPSC_CONTAINER" ]; then
  echo "usage: start_docker_cluster.sh OPSCContainerName"
  echo "  OPSCContainerName   mandatory name of the container running OpsCenter"
  exit 1
fi

[ -z "$CLUSTER_NAME" ] && CLUSTER_NAME="Test_Cluster"

STOMP_INTERFACE=`docker exec $OPSC_CONTAINER hostname -I`
docker run -p 7080:7080 -p 4040:4040 -p 7077:7077 -p 9042:9042 --link $OPSC_CONTAINER -d -e CLUSTER_NAME="$CLUSTER_NAME" -e STOMP_INTERFACE="$STOMP_INTERFACE" --name dse dse -k -t

-k -t 标志 indicate that we're going to be launching both Hadoop and Spark for this container 。我已经删除了 -t 标志，即使没有它，仍然会发生此配置错误。

我需要做什么才能使 /opt/dse/resources/hadoop/conf 目录可写，以便 DSE 能够成功启动？

Answer 1

将 'chown -RHh cassandra:cassandra/opt/dse' 添加到入口点脚本解决了我无法写入/opt/dse/resources/hadoop/conf 的问题。

回复。错误 04:15:04,789 SPARK-WORKER Logging.scala:74 - 无法创建工作目录/var/lib/spark/worker

检查您的spark-env.sh，并查看您的目录映射。就我而言，我安装了两个外部卷 -/data 和/logs。这两个目录均属于 cassandra:cassandra。

# This is a base directory for Spark Worker work files.
if [ "x$SPARK_WORKER_DIR" = "x" ]; then
    export SPARK_WORKER_DIR="/data/spark/worker"
fi

if [ "x$SPARK_LOCAL_DIRS" = "x" ]; then
    export SPARK_LOCAL_DIRS="/data/spark/rdd"
fi

# This is a base directory for Spark Worker logs.
if [ "x$SPARK_WORKER_LOG_DIR" = "x" ]; then
   export SPARK_WORKER_LOG_DIR="/logs/spark/worker"
fi

# This is a base directory for Spark Master logs.
if [ "x$SPARK_MASTER_LOG_DIR" = "x" ]; then
   export SPARK_MASTER_LOG_DIR="/logs/spark/master"
fi

该视频展示了在 docker 上运行的功能齐全的 DSE Enterprise:https://vimeo.com/181393134