vendor files

vendor/k8s.io/kubernetes/test/images/pets/peer-finder/BASEIMAGE

@@ -0,0 +1,4 @@
+amd64=gcr.io/google-containers/debian-base-amd64:0.3
+arm=gcr.io/google-containers/debian-base-arm:0.3
+arm64=gcr.io/google-containers/debian-base-arm64:0.3
+ppc64le=gcr.io/google-containers/debian-base-ppc64le:0.3

vendor/k8s.io/kubernetes/test/images/pets/peer-finder/BUILD

@@ -0,0 +1,33 @@
+package(default_visibility = ["//visibility:public"])
+
+load(
+    "@io_bazel_rules_go//go:def.bzl",
+    "go_binary",
+    "go_library",
+)
+
+go_binary(
+    name = "peer-finder",
+    importpath = "k8s.io/kubernetes/test/images/pets/peer-finder",
+    library = ":go_default_library",
+)
+
+go_library(
+    name = "go_default_library",
+    srcs = ["peer-finder.go"],
+    importpath = "k8s.io/kubernetes/test/images/pets/peer-finder",
+    deps = ["//vendor/k8s.io/apimachinery/pkg/util/sets:go_default_library"],
+)
+
+filegroup(
+    name = "package-srcs",
+    srcs = glob(["**"]),
+    tags = ["automanaged"],
+    visibility = ["//visibility:private"],
+)
+
+filegroup(
+    name = "all-srcs",
+    srcs = [":package-srcs"],
+    tags = ["automanaged"],
+)

vendor/k8s.io/kubernetes/test/images/pets/peer-finder/Dockerfile

@@ -0,0 +1,24 @@
+# Copyright 2016 The Kubernetes Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+FROM BASEIMAGE
+
+CROSS_BUILD_COPY qemu-QEMUARCH-static /usr/bin/
+
+RUN clean-install wget bash dnsutils
+
+COPY peer-finder /
+
+EXPOSE 9376
+ENTRYPOINT ["/peer-finder"]

vendor/k8s.io/kubernetes/test/images/pets/peer-finder/Makefile

@@ -0,0 +1,25 @@
+# Copyright 2016 The Kubernetes Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+SRCS = peer-finder
+ARCH ?= amd64
+TARGET ?= $(CURDIR)
+GOLANG_VERSION ?= latest
+SRC_DIR = pets/peer-finder
+export
+
+bin:
+	../../image-util.sh bin $(SRCS)
+
+.PHONY: bin

vendor/k8s.io/kubernetes/test/images/pets/peer-finder/README.md

@@ -0,0 +1,39 @@
+# Peer finder
+
+This is a simple peer finder daemon that is useful with StatefulSet and related use cases.
+
+All it does is watch DNS for changes in the set of endpoints that are part of the governing service
+of the PetSet.  It periodically looks up the SRV record of the DNS entry that corresponds to a Kubernetes
+Service which enumerates the set of peers for this  the specified service.
+
+Be sure to use the `service.alpha.kubernetes.io/tolerate-unready-endpoints` on the governing service
+of the StatefulSet so that all peers are listed in endpoints before any peers are started.
+
+There are several ways to bundle it with your main application.
+
+1. In an [init container](http://kubernetes.io/docs/user-guide/pods/init-container/),
+   to help your pod determine its peers when it it first started (determine the desired set of 
+   peers from the governing service of the StatefulSet.  For this use case, the `--on-start` option
+   can be used, but the `--on-change` option should not be used since the init container will no
+   longer be running after the pod is started.  An example of an `--on-start` script would be to
+   edit a configuration file for the main app to insert the list of peers.  This file needs to be
+   on a Volume shared between the init container and the main container.
+2. In a sidecar (e.g. a second container in the same pod as the main app), in which case the `--on-change`
+   option can be used, but `--on-start` may not be useful without a way to guarantee the ordering
+   of the sidecar relative to the main app container.  An example of an on-change script would be to
+   send an administrative command to the main container over the localhost network. (Note that signalling
+   is not practical since pods currently do not share a PID namespace).
+3. As pid 1 of the main container, in which case both `--on-change`  and `--on-start` may be used.
+   In this mode, the ordering of the peer-finder relative to the main app is ensured by having the peer
+   finder start the main app.  An example script would be to modify a configuration file and send SIGHUP
+   to the main process.
+4. Both 1 and 2.
+
+Options 1 and 2 and 4 may be preferable since they do not require changes to the main container image.
+Option 3 is useful is signalling is necessary.
+
+The peer-finder tool is intended to help legacy applications run in containers on Kubernetes.
+If possible, it may be preferable to modify an applications to poll DNS itself to determine its peer set.
+
+Not all StatefulSets are able to be scaled.  For unscalable StatefulSets, only the on-start message is needed, and
+so option 1 is a good choice.

vendor/k8s.io/kubernetes/test/images/pets/peer-finder/VERSION

@@ -0,0 +1 @@
+1.1

vendor/k8s.io/kubernetes/test/images/pets/peer-finder/peer-finder.go

@@ -0,0 +1,128 @@
+/*
+Copyright 2014 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// A small utility program to lookup hostnames of endpoints in a service.
+package main
+
+import (
+	"flag"
+	"fmt"
+	"io/ioutil"
+	"log"
+	"net"
+	"os"
+	"os/exec"
+	"sort"
+	"strings"
+	"time"
+
+	"k8s.io/apimachinery/pkg/util/sets"
+)
+
+const (
+	pollPeriod = 1 * time.Second
+)
+
+var (
+	onChange  = flag.String("on-change", "", "Script to run on change, must accept a new line separated list of peers via stdin.")
+	onStart   = flag.String("on-start", "", "Script to run on start, must accept a new line separated list of peers via stdin.")
+	svc       = flag.String("service", "", "Governing service responsible for the DNS records of the domain this pod is in.")
+	namespace = flag.String("ns", "", "The namespace this pod is running in. If unspecified, the POD_NAMESPACE env var is used.")
+	domain    = flag.String("domain", "cluster.local", "The Cluster Domain which is used by the Cluster.")
+)
+
+func lookup(svcName string) (sets.String, error) {
+	endpoints := sets.NewString()
+	_, srvRecords, err := net.LookupSRV("", "", svcName)
+	if err != nil {
+		return endpoints, err
+	}
+	for _, srvRecord := range srvRecords {
+		// The SRV records ends in a "." for the root domain
+		ep := fmt.Sprintf("%v", srvRecord.Target[:len(srvRecord.Target)-1])
+		endpoints.Insert(ep)
+	}
+	return endpoints, nil
+}
+
+func shellOut(sendStdin, script string) {
+	log.Printf("execing: %v with stdin: %v", script, sendStdin)
+
+	cmd := exec.Command(script)
+	stdin, err := cmd.StdinPipe()
+	if err != nil {
+		log.Fatalf("Failed to get stdin pipe: %v", err)
+	}
+	stdout, err := cmd.StdoutPipe()
+	if err != nil {
+		log.Fatalf("Failed to get stdout pipe: %v", err)
+	}
+
+	cmd.Start()
+
+	stdin.Write([]byte(sendStdin))
+	stdin.Close()
+
+	out, err := ioutil.ReadAll(stdout)
+	if err != nil {
+		log.Fatalf("Failed to execute %v: %v, err: %v", script, string(out), err)
+	}
+
+	log.Print(string(out))
+}
+
+func main() {
+	flag.Parse()
+
+	ns := *namespace
+	if ns == "" {
+		ns = os.Getenv("POD_NAMESPACE")
+	}
+	if *svc == "" || ns == "" || (*onChange == "" && *onStart == "") {
+		log.Fatalf("Incomplete args, require -on-change and/or -on-start, -service and -ns or an env var for POD_NAMESPACE.")
+	}
+
+	hostname, err := os.Hostname()
+	if err != nil {
+		log.Fatalf("Failed to get hostname: %s", err)
+	}
+
+	svcLocalSuffix := strings.Join([]string{"svc", *domain}, ".")
+	myName := strings.Join([]string{hostname, *svc, ns, svcLocalSuffix}, ".")
+	script := *onStart
+	if script == "" {
+		script = *onChange
+		log.Printf("No on-start supplied, on-change %v will be applied on start.", script)
+	}
+	for newPeers, peers := sets.NewString(), sets.NewString(); script != ""; time.Sleep(pollPeriod) {
+		newPeers, err = lookup(*svc)
+		if err != nil {
+			log.Printf("%v", err)
+			continue
+		}
+		if newPeers.Equal(peers) || !newPeers.Has(myName) {
+			continue
+		}
+		peerList := newPeers.List()
+		sort.Strings(peerList)
+		log.Printf("Peer list updated\nwas %v\nnow %v", peers.List(), newPeers.List())
+		shellOut(strings.Join(peerList, "\n"), script)
+		peers = newPeers
+		script = *onChange
+	}
+	// TODO: Exit if there's no on-change?
+	log.Printf("Peer finder exiting")
+}

vendor/k8s.io/kubernetes/test/images/pets/redis-installer/BASEIMAGE

@@ -0,0 +1,4 @@
+amd64=gcr.io/google-containers/debian-base-amd64:0.3
+arm=gcr.io/google-containers/debian-base-arm:0.3
+arm64=gcr.io/google-containers/debian-base-arm64:0.3
+ppc64le=gcr.io/google-containers/debian-base-ppc64le:0.3

vendor/k8s.io/kubernetes/test/images/pets/redis-installer/Dockerfile

@@ -0,0 +1,40 @@
+# Copyright 2016 The Kubernetes Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# TODO: get rid of bash dependency and switch to plain busybox.
+# The tar in busybox also doesn't seem to understand compression.
+FROM BASEIMAGE
+
+CROSS_BUILD_COPY qemu-QEMUARCH-static /usr/bin/
+
+# TODO: just use standard redis when there is one for 3.2.0.
+RUN clean-install wget make gcc libc-dev
+
+# See README.md
+RUN wget -qO /redis-3.2.0.tar.gz http://download.redis.io/releases/redis-3.2.0.tar.gz && \
+    tar -xzf /redis-3.2.0.tar.gz -C /tmp/ && rm /redis-3.2.0.tar.gz
+
+# Clean out existing deps before installation
+# see https://github.com/antirez/redis/issues/722
+RUN cd /tmp/redis-3.2.0 && make distclean && mkdir -p /redis && \
+    make install INSTALL_BIN=/redis && \
+    mv /tmp/redis-3.2.0/redis.conf /redis/redis.conf && \
+    rm -rf /tmp/redis-3.2.0
+
+ADD on-start.sh /
+
+COPY peer-finder /
+ADD install.sh /
+RUN chmod -c 755 /install.sh /on-start.sh /peer-finder
+Entrypoint ["/install.sh"]

vendor/k8s.io/kubernetes/test/images/pets/redis-installer/Makefile

@@ -0,0 +1,25 @@
+# Copyright 2016 The Kubernetes Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+SRCS = peer-finder
+ARCH ?= amd64
+TARGET ?= $(CURDIR)
+GOLANG_VERSION ?= latest
+SRC_DIR = pets/peer-finder
+export
+
+bin:
+	../../image-util.sh bin $(SRCS)
+
+.PHONY: bin

vendor/k8s.io/kubernetes/test/images/pets/redis-installer/README.md

@@ -0,0 +1,12 @@
+# Redis statefulset e2e tester
+
+The image in this directory is the init container for contrib/pets/redis but for one difference, it bakes a specific version of redis into the base image so we get deterministic test results without having to depend on a redis download server. Discussing the tradeoffs to either approach (download the version at runtime, or maintain an image per version) are outside the scope of this document.
+
+You can execute the image locally via:
+```
+$ docker run -it gcr.io/google_containers/redis-install-3.2.0:e2e --cmd --install-into=/opt --work-dir=/work-dir
+```
+To share the installation with other containers mount the appropriate volumes as `--install-into` and `--work-dir`, where `install-into` is the directory to install redis into, and `work-dir` is the directory to install the user/admin supplied on-{start,change} hook scripts.
+
+
+[![Analytics](https://kubernetes-site.appspot.com/UA-36037335-10/GitHub/test/images/pets/redis/README.md?pixel)]()

vendor/k8s.io/kubernetes/test/images/pets/redis-installer/VERSION

@@ -0,0 +1 @@
+1.1

vendor/k8s.io/kubernetes/test/images/pets/redis-installer/install.sh

@@ -0,0 +1,51 @@
+#! /bin/bash
+
+# Copyright 2016 The Kubernetes Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# This volume is assumed to exist and is shared with parent of the init
+# container. It contains the redis installation.
+INSTALL_VOLUME="/opt"
+
+# This volume is assumed to exist and is shared with the peer-finder
+# init container. It contains on-start/change configuration scripts.
+WORK_DIR="/work-dir"
+
+VERSION="3.2.0"
+
+for i in "$@"
+do
+case $i in
+    -i=*|--install-into=*)
+    INSTALL_VOLUME="${i#*=}"
+    shift
+    ;;
+    -w=*|--work-dir=*)
+    WORK_DIR="${i#*=}"
+    shift
+    ;;
+    *)
+    # unknown option
+    ;;
+esac
+done
+
+echo installing config scripts into "${WORK_DIR}"
+mkdir -p "${WORK_DIR}"
+cp /on-start.sh "${WORK_DIR}"/
+cp /peer-finder "${WORK_DIR}"/
+
+echo installing redis-"${VERSION}" into "${INSTALL_VOLUME}"
+mkdir -p "${INSTALL_VOLUME}"
+mv /redis "${INSTALL_VOLUME}"/redis

vendor/k8s.io/kubernetes/test/images/pets/redis-installer/on-start.sh

@@ -0,0 +1,49 @@
+#!/bin/bash
+
+# Copyright 2016 The Kubernetes Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -e
+
+CFG=/opt/redis/redis.conf
+HOSTNAME=$(hostname)
+DATADIR="/data"
+# Port on which redis listens for connections.
+PORT=6379
+
+# Ping everyone but ourself to see if there's a master. Only one pet starts at
+# a time, so if we don't see a master we can assume the position is ours.
+while read -ra LINE; do
+    if [[ "${LINE}" == *"${HOSTNAME}"* ]]; then
+        sed -i -e "s|^bind.*$|bind ${LINE}|" ${CFG}
+    elif [ "$(/opt/redis/redis-cli -h $LINE info | grep role | sed 's,\r$,,')" = "role:master" ]; then
+        # TODO: More restrictive regex?
+        sed -i -e "s|^# slaveof.*$|slaveof ${LINE} ${PORT}|" ${CFG}
+    fi
+done
+
+# Set the data directory for append only log and snapshot files. This should
+# be a persistent volume for consistency.
+sed -i -e "s|^.*dir .*$|dir ${DATADIR}|" ${CFG}
+
+# The append only log is written for every SET operation. Without this setting,
+# redis just snapshots periodically which is only safe for a cache. This will
+# produce an appendonly.aof file in the configured data dir.
+sed -i -e "s|^appendonly .*$|appendonly yes|" ${CFG}
+
+# Every write triggers an fsync. Recommended default is "everysec", which
+# is only safe for AP applications.
+sed -i -e "s|^appendfsync .*$|appendfsync always|" ${CFG}
+
+

vendor/k8s.io/kubernetes/test/images/pets/zookeeper-installer/BASEIMAGE

@@ -0,0 +1,4 @@
+amd64=gcr.io/google-containers/debian-base-amd64:0.3
+arm=gcr.io/google-containers/debian-base-arm:0.3
+arm64=gcr.io/google-containers/debian-base-arm64:0.3
+ppc64le=gcr.io/google-containers/debian-base-ppc64le:0.3

vendor/k8s.io/kubernetes/test/images/pets/zookeeper-installer/Dockerfile

@@ -0,0 +1,33 @@
+# Copyright 2016 The Kubernetes Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# TODO: get rid of bash dependency and switch to plain busybox.
+# The tar in busybox also doesn't seem to understand compression.
+FROM BASEIMAGE
+
+CROSS_BUILD_COPY qemu-QEMUARCH-static /usr/bin/
+
+RUN clean-install wget netcat
+
+ADD on-start.sh /
+
+COPY peer-finder /
+
+# See README.md
+RUN wget -q -O /zookeeper-3.5.0-alpha.tar.gz http://apache.mirrors.pair.com/zookeeper/zookeeper-3.5.0-alpha/zookeeper-3.5.0-alpha.tar.gz && \
+    tar -xzf /zookeeper-3.5.0-alpha.tar.gz -C /tmp/ && mv /tmp/zookeeper-3.5.0-alpha /zookeeper && rm /zookeeper-3.5.0-alpha.tar.gz
+
+ADD install.sh /
+RUN chmod -c 755 /install.sh /on-start.sh /peer-finder
+Entrypoint ["/install.sh"]

vendor/k8s.io/kubernetes/test/images/pets/zookeeper-installer/Makefile

@@ -0,0 +1,25 @@
+# Copyright 2016 The Kubernetes Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+SRCS = peer-finder
+ARCH ?= amd64
+TARGET ?= $(CURDIR)
+GOLANG_VERSION ?= latest
+SRC_DIR = pets/peer-finder
+export
+
+bin:
+	../../image-util.sh bin $(SRCS)
+
+.PHONY: bin

vendor/k8s.io/kubernetes/test/images/pets/zookeeper-installer/README.md

@@ -0,0 +1,12 @@
+# Zookeeper statefulset e2e tester
+
+The image in this directory is the init container for contrib/pets/zookeeper but for one difference, it bakes a specific version of zookeeper into the base image so we get deterministic test results without having to depend on a zookeeper download server. Discussing the tradeoffs to either approach (download the version at runtime, or maintain an image per version) are outside the scope of this document.
+
+You can execute the image locally via:
+```
+$ docker run -it gcr.io/google_containers/zookeeper-install-3.5.0-alpha:e2e --cmd --install-into=/opt --work-dir=/work-dir
+```
+To share the installation with other containers mount the appropriate volumes as `--install-into` and `--work-dir`, where `install-into` is the directory to install zookeeper into, and `work-dir` is the directory to install the user/admin supplied on-{start,change} hook scripts.
+
+
+[![Analytics](https://kubernetes-site.appspot.com/UA-36037335-10/GitHub/test/images/pets/zookeeper/README.md?pixel)]()

vendor/k8s.io/kubernetes/test/images/pets/zookeeper-installer/VERSION

@@ -0,0 +1 @@
+1.1

vendor/k8s.io/kubernetes/test/images/pets/zookeeper-installer/install.sh

@@ -0,0 +1,70 @@
+#! /bin/bash
+
+# Copyright 2016 The Kubernetes Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# This volume is assumed to exist and is shared with parent of the init
+# container. It contains the zookeeper installation.
+INSTALL_VOLUME="/opt"
+
+# This volume is assumed to exist and is shared with the peer-finder
+# init container. It contains on-start/change configuration scripts.
+WORKDIR_VOLUME="/work-dir"
+
+# As of April-2016 is 3.4.8 is the latest stable, but versions 3.5.0 onward
+# allow dynamic reconfiguration.
+VERSION="3.5.0-alpha"
+
+for i in "$@"
+do
+case $i in
+    -i=*|--install-into=*)
+    INSTALL_VOLUME="${i#*=}"
+    shift
+    ;;
+    -w=*|--work-dir=*)
+    WORKDIR_VOLUME="${i#*=}"
+    shift
+    ;;
+    *)
+    # unknown option
+    ;;
+esac
+done
+
+echo installing config scripts into "${WORKDIR_VOLUME}"
+mkdir -p "${WORKDIR_VOLUME}"
+cp /on-start.sh "${WORKDIR_VOLUME}"/
+cp /peer-finder "${WORKDIR_VOLUME}"/
+
+echo installing zookeeper-"${VERSION}" into "${INSTALL_VOLUME}"
+mkdir -p "${INSTALL_VOLUME}"
+mv /zookeeper "${INSTALL_VOLUME}"/zookeeper
+cp "${INSTALL_VOLUME}"/zookeeper/conf/zoo_sample.cfg "${INSTALL_VOLUME}"/zookeeper/conf/zoo.cfg
+
+# TODO: Should dynamic config be tied to the version?
+IFS="." read -ra RELEASE <<< "${VERSION}"
+if [ $(expr "${RELEASE[1]}") -gt 4 ]; then
+    echo zookeeper-"${VERSION}" supports dynamic reconfiguration, enabling it
+    echo "standaloneEnabled=false" >> "${INSTALL_VOLUME}"/zookeeper/conf/zoo.cfg
+    echo "dynamicConfigFile="${INSTALL_VOLUME}"/zookeeper/conf/zoo.cfg.dynamic" >> "${INSTALL_VOLUME}"/zookeeper/conf/zoo.cfg
+fi
+
+# TODO: This is a hack, netcat is convenient to have in the zookeeper container
+# I want to avoid using a custom zookeeper image just for this. So copy it.
+NC=$(which nc)
+if [ "${NC}" != "" ]; then
+    echo copying nc into "${INSTALL_VOLUME}"
+    cp "${NC}" "${INSTALL_VOLUME}"
+fi

vendor/k8s.io/kubernetes/test/images/pets/zookeeper-installer/on-start.sh

@@ -0,0 +1,106 @@
+#! /bin/bash
+
+# Copyright 2016 The Kubernetes Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -eo pipefail
+
+# This script configures zookeeper cluster member ship for version of zookeeper
+# >= 3.5.0. It should not be used with the on-change.sh script in this example.
+# As of April-2016 is 3.4.8 is the latest stable.
+
+# Both /opt and /tmp/zookeeper are assumed to be volumes shared with the parent.
+# The format of each line in the dynamic config file is:
+# server.<1 based index>=<server-dns-name>:<peer port>:<election port>[:role];[<client port address>:]<client port>
+# <1 based index> is the server index that matches the id in datadir/myid
+# <peer port> is the port on which peers communicate to agree on updates
+# <election port> is the port used for leader election
+# [:role] can be set to observer, participant by default
+# <client port address> is optional and defaults to 0.0.0.0
+# <client port> is the port on which the server accepts client connections
+
+CFG=/opt/zookeeper/conf/zoo.cfg.dynamic
+CFG_BAK=/opt/zookeeper/conf/zoo.cfg.bak
+MY_ID_FILE=/tmp/zookeeper/myid
+HOSTNAME=$(hostname)
+
+while read -ra LINE; do
+    PEERS=("${PEERS[@]}" $LINE)
+done
+
+# Don't add the first member as an observer
+if [ ${#PEERS[@]} -eq 1 ]; then
+    # We need to write our index in this list of servers into MY_ID_FILE.
+    # Note that this may not always coincide with the hostname id.
+    echo 1 > "${MY_ID_FILE}"
+    echo "server.1=${PEERS[0]}:2888:3888;2181" > "${CFG}"
+    # TODO: zkServer-initialize is the safe way to handle changes to datadir
+    # because simply starting will create a new datadir, BUT if the user changed
+    # pod template they might end up with 2 datadirs and brief split brain.
+    exit
+fi
+
+# Every subsequent member is added as an observer and promoted to a participant
+echo "" > "${CFG_BAK}"
+i=0
+LEADER=$HOSTNAME
+for peer in "${PEERS[@]}"; do
+    let i=i+1
+    if [[ "${peer}" == *"${HOSTNAME}"* ]]; then
+      MY_ID=$i
+      MY_NAME=${peer}
+      echo $i > "${MY_ID_FILE}"
+      echo "server.${i}=${peer}:2888:3888:observer;2181" >> "${CFG_BAK}"
+    else
+      if [[ $(echo srvr | /opt/nc "${peer}" 2181 | grep Mode) = "Mode: leader" ]]; then
+        LEADER="${peer}"
+      fi
+      echo "server.${i}=${peer}:2888:3888:participant;2181" >> "${CFG_BAK}"
+    fi
+done
+
+# zookeeper won't start without myid anyway.
+# This means our hostname wasn't in the peer list.
+if [ ! -f "${MY_ID_FILE}" ]; then
+  exit 1
+fi
+
+# Once the dynamic config file is written it shouldn't be modified, so the final
+# reconfigure needs to happen through the "reconfig" command.
+cp ${CFG_BAK} ${CFG}
+
+# TODO: zkServer-initialize is the safe way to handle changes to datadir
+# because simply starting will create a new datadir, BUT if the user changed
+# pod template they might end up with 2 datadirs and brief split brain.
+/opt/zookeeper/bin/zkServer.sh start
+
+# TODO: We shouldn't need to specify the address of the master as long as
+# there's quorum. According to the docs the new server is just not allowed to
+# vote, it's still allowed to propose config changes, and it knows the
+# existing members of the ensemble from *its* config.
+ADD_SERVER="server.$MY_ID=$MY_NAME:2888:3888:participant;0.0.0.0:2181"
+/opt/zookeeper/bin/zkCli.sh reconfig -s "${LEADER}":2181 -add "${ADD_SERVER}"
+
+# Prove that we've actually joined the running cluster
+ITERATION=0
+until $(echo config | /opt/nc localhost 2181 | grep "${ADD_SERVER}" > /dev/null); do
+  echo $ITERATION] waiting for updated config to sync back to localhost
+  sleep 1
+  let ITERATION=ITERATION+1
+  if [ $ITERATION -eq 20 ]; then
+    exit 1
+  fi
+done
+
+/opt/zookeeper/bin/zkServer.sh stop