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Disabling Java DNS cache for Zookeeper ensemble on docker #1

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Disabling Java DNS cache for Zookeeper ensemble on docker #1

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f506c65
Disables Java's DNS cache by default
dbaba Jul 12, 2015
e4f9dbd
Exposes Zookeeper's default ports
dbaba Jul 12, 2015
2729c11
Allows to modify zoo.cfg with environment variables on starting a new…
dbaba Jul 16, 2015
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5 changes: 5 additions & 0 deletions 3.4.6/centos/7/Dockerfile
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Expand Up @@ -4,6 +4,11 @@ RUN yum install -y java-1.7.0-openjdk-headless tar

RUN curl -fL http://mirror.catn.com/pub/apache/zookeeper/stable/zookeeper-3.4.6.tar.gz | tar xzf - -C /opt && mv /opt/zookeeper-3.4.6 /opt/zookeeper

RUN echo "networkaddress.cache.ttl=0" >> /usr/lib/jvm/jre/lib/security/java.security && \
sed -i 's/networkaddress.cache.negative.ttl=10/networkaddress.cache.negative.ttl=0/g' /usr/lib/jvm/jre/lib/security/java.security

EXPOSE 2181 2888 3888

VOLUME /tmp/zookeeper

COPY entrypoint.sh /
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9 changes: 5 additions & 4 deletions 3.4.6/centos/7/entrypoint.sh
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Original file line number Diff line number Diff line change
@@ -1,12 +1,13 @@
#!/bin/sh
#!/bin/bash

# based on https://github.com/apache/zookeeper/blob/trunk/conf/zoo_sample.cfg
cat > /opt/zookeeper/conf/zoo.cfg <<EOF
tickTime=2000
initLimit=10
syncLimit=5
tickTime=${TICK_TIME:-2000}
initLimit=${INIT_LIMIT:-10}
syncLimit=${SYNC_LIMIT:-5}
dataDir=/tmp/zookeeper
clientPort=2181
cnxTimeout=${CNX_TO_MS:-5000}
EOF

# server.1=...
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5 changes: 5 additions & 0 deletions 3.4.6/ubuntu/14.04/Dockerfile
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Expand Up @@ -4,6 +4,11 @@ RUN apt-get update && apt-get install -y curl openjdk-7-jre-headless python

RUN curl -fL http://mirror.catn.com/pub/apache/zookeeper/stable/zookeeper-3.4.6.tar.gz | tar xzf - -C /opt && mv /opt/zookeeper-3.4.6 /opt/zookeeper

RUN echo "networkaddress.cache.ttl=0" >> /etc/java-7-openjdk/security/java.security && \
sed -i 's/networkaddress.cache.negative.ttl=10/networkaddress.cache.negative.ttl=0/g' /etc/java-7-openjdk/security/java.security

EXPOSE 2181 2888 3888

VOLUME /tmp/zookeeper

COPY entrypoint.sh /
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9 changes: 5 additions & 4 deletions 3.4.6/ubuntu/14.04/entrypoint.sh
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Original file line number Diff line number Diff line change
@@ -1,12 +1,13 @@
#!/bin/sh
#!/bin/bash

# based on https://github.com/apache/zookeeper/blob/trunk/conf/zoo_sample.cfg
cat > /opt/zookeeper/conf/zoo.cfg <<EOF
tickTime=2000
initLimit=10
syncLimit=5
tickTime=${TICK_TIME:-2000}
initLimit=${INIT_LIMIT:-10}
syncLimit=${SYNC_LIMIT:-5}
dataDir=/tmp/zookeeper
clientPort=2181
cnxTimeout=${CNX_TO_MS:-5000}
EOF

# server.1=...
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