Question

有没有办法在初始化两个MarkLogic节点后将它们添加到群集中？我有自动脚本使用ML amis在AWS中构建新节点。使用该配置，节点在启动时已经配置完毕，并且没有用于加入集群的初始化屏幕。有什么方法可以加入已经处于这种状态的节点？

Answer 1

我不得不修改http://docs.marklogic.com/guide/admin-api/cluster#id_52842上的脚本才能使其对我有用。

主要变化是：

由于服务器已经初始化，因此不需要执行（1）。我只是将其切换为获取时间戳。
对于端点，请使用$ AUTH_CURL而不是$ CURL，因为它们现在都已受到保护。

-

#!/bin/bash
################################################################
# Use this script to initialize and add one or more hosts to a
# MarkLogic Server cluster. The first (bootstrap) host for the
# cluster should already be fully initialized.  
#
# Use the options to control admin username and password,
# authentication mode, and the security realm. At least two hostnames
# must be given: A host already in the cluster, and at least one host
# to be added to the cluster. Only minimal error checking is performed,
# so this script is not suitable for production use.
#
# Usage:  this_command [options] cluster-host joining-host(s)
#
################################################################

USER="admin"
PASS="password"
AUTH_MODE="anyauth"
N_RETRY=5
RETRY_INTERVAL=10

#######################################################
# restart_check(hostname, baseline_timestamp, caller_lineno)
#
# Use the timestamp service to detect a server restart, given a
# a baseline timestamp. Use N_RETRY and RETRY_INTERVAL to tune
# the test length. Include authentication in the curl command
# so the function works whether or not security is initialized.
#   $1 :  The hostname to test against
#   $2 :  The baseline timestamp
#   $3 :  Invokers LINENO, for improved error reporting
# Returns 0 if restart is detected, exits with an error if not.
#
function restart_check {
  LAST_START=`$AUTH_CURL "http://$1:8001/admin/v1/timestamp"`
  for i in `seq 1 ${N_RETRY}`; do
    if [ "$2" == "$LAST_START" ] || [ "$LAST_START" == "" ]; then
      sleep ${RETRY_INTERVAL}
      LAST_START=`$AUTH_CURL "http://$1:8001/admin/v1/timestamp"`
    else
      return 0
    fi
  done
  echo "ERROR: Line $3: Failed to restart $1"
  exit 1
}


#######################################################
# Parse the command line

OPTIND=1
while getopts ":a:p:u:" opt; do
  case "$opt" in
    a) AUTH_MODE=$OPTARG ;;
    p) PASS=$OPTARG ;;
    u) USER=$OPTARG ;;
    \?) echo "Unrecognized option: -$OPTARG" >&2; exit 1 ;;
  esac
done
shift $((OPTIND-1))

if [ $# -ge 2 ]; then
  BOOTSTRAP_HOST=$1
  shift
else
  echo "ERROR: At least two hostnames are required." >&2
  exit 1
fi
ADDITIONAL_HOSTS=$@

# Curl command for all requests. Suppress progress meter (-s),
# but still show errors (-S)
CURL="curl -s -S"
# Curl command when authentication is required, after security
# is initialized.
AUTH_CURL="${CURL} --${AUTH_MODE} --user ${USER}:${PASS}"


#######################################################
# Add one or more hosts to a cluster. For each host joining
# the cluster:
#   (1) POST /admin/v1/init (joining host)
#   (2) GET /admin/v1/server-config (joining host)
#   (3) POST /admin/v1/cluster-config (bootstrap host)
#   (4) POST /admin/v1/cluster-config (joining host)
# GET /admin/v1/timestamp is used to confirm restarts.

for JOINING_HOST in $ADDITIONAL_HOSTS; do
  echo "Adding host to cluster: $JOINING_HOST..."

  # (1) Initialize MarkLogic Server on the joining host
  TIMESTAMP=`$AUTH_CURL -X GET \
     http://${JOINING_HOST}:8001/admin/v1/timestamp`
  if [ "$TIMESTAMP" == "" ]; then
    echo "ERROR: Failed to initialize $JOINING_HOST" >&2
    exit 1
  fi
  #restart_check $JOINING_HOST $TIMESTAMP $LINENO

  # (2) Retrieve the joining host's configuration
JOINER_CONFIG=`$AUTH_CURL -X GET -H "Accept: application/xml" \
        http://${JOINING_HOST}:8001/admin/v1/server-config`
  echo $JOINER_CONFIG | grep -q "^<host"
  if [ "$?" -ne 0 ]; then
    echo "ERROR: Failed to fetch server config for $JOINING_HOST"
    exit 1
  fi

  # (3) Send the joining host's config to the bootstrap host, receive
  #     the cluster config data needed to complete the join. Save the
  #     response data to cluster-config.zip.
  $AUTH_CURL -X POST -o cluster-config.zip -d "group=Default" \
        --data-urlencode "server-config=${JOINER_CONFIG}" \
        -H "Content-type: application/x-www-form-urlencoded" \
        http://${BOOTSTRAP_HOST}:8001/admin/v1/cluster-config
  if [ "$?" -ne 0 ]; then
    echo "ERROR: Failed to fetch cluster config from $BOOTSTRAP_HOST"
    exit 1
  fi
  if [ `file cluster-config.zip | grep -cvi "zip archive data"` -eq 1 ]; then
    echo "ERROR: Failed to fetch cluster config from $BOOTSTRAP_HOST"
    exit 1
  fi

  # (4) Send the cluster config data to the joining host, completing
  #     the join sequence.
  TIMESTAMP=`$AUTH_CURL -X POST -H "Content-type: application/zip" \
      --data-binary @./cluster-config.zip \
      http://${JOINING_HOST}:8001/admin/v1/cluster-config \
      | grep "last-startup" \
      | sed 's%^.*<last-startup.*>\(.*\)</last-startup>.*$%\1%'`
  restart_check $JOINING_HOST $TIMESTAMP $LINENO
  rm ./cluster-config.zip

  echo "...$JOINING_HOST successfully added to the cluster."
done

Answer 2

请注意，如果您使用MarkLogic的“托管群集”功能，则不需要您自己的任何部署或群集加入脚本，该功能除了可以通过自动替换故障节点并重新连接提供HA之外，还可以透明地对其进行管理。到EBS存储，以及随时暂停和重新启动群集的功能。使用受管群集功能，任何大小（> = 3）的群集都可以承受所有节点的全部故障，并且无需手动干预即可自动恢复。添加节点只需更改云形成脚本中的参数即可。您可能要为下一个群集研究此功能。

事实之后的MarkLogic集群

2 个答案: