如何在docker中安装docker(docker in docker)

dockerfile中加入下边一句

dockerfile中加入下边一句

RUN curl -fsSL get.docker.com | bash

脚本内容

#!/bin/sh
set -e

# This script is meant for quick & easy install via:
#   $ curl -fsSL https://get.docker.com -o get-docker.sh
#   $ sh get-docker.sh
#
# For test builds (ie. release candidates):
#   $ curl -fsSL https://test.docker.com -o test-docker.sh
#   $ sh test-docker.sh
#
# NOTE: Make sure to verify the contents of the script
#       you downloaded matches the contents of install.sh
#       located at https://github.com/docker/docker-install
#       before executing.
#
# Git commit from https://github.com/docker/docker-install when
# the script was uploaded (Should only be modified by upload job):
SCRIPT_COMMIT_SHA=cfba462


# The channel to install from:
#   * nightly
#   * test
#   * stable
#   * edge (deprecated)
DEFAULT_CHANNEL_VALUE="stable"
if [ -z "$CHANNEL" ]; then
	CHANNEL=$DEFAULT_CHANNEL_VALUE
fi

DEFAULT_DOWNLOAD_URL="https://download.docker.com"
if [ -z "$DOWNLOAD_URL" ]; then
	DOWNLOAD_URL=$DEFAULT_DOWNLOAD_URL
fi

DEFAULT_REPO_FILE="docker-ce.repo"
if [ -z "$REPO_FILE" ]; then
	REPO_FILE="$DEFAULT_REPO_FILE"
fi

mirror=''
DRY_RUN=${DRY_RUN:-}
while [ $# -gt 0 ]; do
	case "$1" in
		--mirror)
			mirror="$2"
			shift
			;;
		--dry-run)
			DRY_RUN=1
			;;
		--*)
			echo "Illegal option $1"
			;;
	esac
	shift $(( $# > 0 ? 1 : 0 ))
done

case "$mirror" in
	Aliyun)
		DOWNLOAD_URL="https://mirrors.aliyun.com/docker-ce"
		;;
	AzureChinaCloud)
		DOWNLOAD_URL="https://mirror.azure.cn/docker-ce"
		;;
esac

command_exists() {
	command -v "$@" > /dev/null 2>&1
}

is_dry_run() {
	if [ -z "$DRY_RUN" ]; then
		return 1
	else
		return 0
	fi
}

deprecation_notice() {
	distro=$1
	date=$2
	echo
	echo "DEPRECATION WARNING:"
	echo "    The distribution, $distro, will no longer be supported in this script as of $date."
	echo "    If you feel this is a mistake please submit an issue at https://github.com/docker/docker-install/issues/new"
	echo
	sleep 10
}

get_distribution() {
	lsb_dist=""
	# Every system that we officially support has /etc/os-release
	if [ -r /etc/os-release ]; then
		lsb_dist="$(. /etc/os-release && echo "$ID")"
	fi
	# Returning an empty string here should be alright since the
	# case statements don't act unless you provide an actual value
	echo "$lsb_dist"
}

add_debian_backport_repo() {
	debian_version="$1"
	backports="deb http://ftp.debian.org/debian $debian_version-backports main"
	if ! grep -Fxq "$backports" /etc/apt/sources.list; then
		(set -x; $sh_c "echo \"$backports\" >> /etc/apt/sources.list")
	fi
}

echo_docker_as_nonroot() {
	if is_dry_run; then
		return
	fi
	if command_exists docker && [ -e /var/run/docker.sock ]; then
		(
			set -x
			$sh_c 'docker version'
		) || true
	fi
	your_user=your-user
	[ "$user" != 'root' ] && your_user="$user"
	# intentionally mixed spaces and tabs here -- tabs are stripped by "<<-EOF", spaces are kept in the output
	echo "If you would like to use Docker as a non-root user, you should now consider"
	echo "adding your user to the \"docker\" group with something like:"
	echo
	echo "  sudo usermod -aG docker $your_user"
	echo
	echo "Remember that you will have to log out and back in for this to take effect!"
	echo
	echo "WARNING: Adding a user to the \"docker\" group will grant the ability to run"
	echo "         containers which can be used to obtain root privileges on the"
	echo "         docker host."
	echo "         Refer to https://docs.docker.com/engine/security/security/#docker-daemon-attack-surface"
	echo "         for more information."

}

# Check if this is a forked Linux distro
check_forked() {

	# Check for lsb_release command existence, it usually exists in forked distros
	if command_exists lsb_release; then
		# Check if the `-u` option is supported
		set +e
		lsb_release -a -u > /dev/null 2>&1
		lsb_release_exit_code=$?
		set -e

		# Check if the command has exited successfully, it means we're in a forked distro
		if [ "$lsb_release_exit_code" = "0" ]; then
			# Print info about current distro
			cat <<-EOF
			You're using '$lsb_dist' version '$dist_version'.
			EOF

			# Get the upstream release info
			lsb_dist=$(lsb_release -a -u 2>&1 | tr '[:upper:]' '[:lower:]' | grep -E 'id' | cut -d ':' -f 2 | tr -d '[:space:]')
			dist_version=$(lsb_release -a -u 2>&1 | tr '[:upper:]' '[:lower:]' | grep -E 'codename' | cut -d ':' -f 2 | tr -d '[:space:]')

			# Print info about upstream distro
			cat <<-EOF
			Upstream release is '$lsb_dist' version '$dist_version'.
			EOF
		else
			if [ -r /etc/debian_version ] && [ "$lsb_dist" != "ubuntu" ] && [ "$lsb_dist" != "raspbian" ]; then
				if [ "$lsb_dist" = "osmc" ]; then
					# OSMC runs Raspbian
					lsb_dist=raspbian
				else
					# We're Debian and don't even know it!
					lsb_dist=debian
				fi
				dist_version="$(sed 's/\/.*//' /etc/debian_version | sed 's/\..*//')"
				case "$dist_version" in
					9)
						dist_version="stretch"
					;;
					8|'Kali Linux 2')
						dist_version="jessie"
					;;
				esac
			fi
		fi
	fi
}

semverParse() {
	major="${1%%.*}"
	minor="${1#$major.}"
	minor="${minor%%.*}"
	patch="${1#$major.$minor.}"
	patch="${patch%%[-.]*}"
}

ee_notice() {
	echo
	echo
	echo "  WARNING: $1 is now only supported by Docker EE"
	echo "           Check https://store.docker.com for information on Docker EE"
	echo
	echo
}

ee_promo() {
	# Randomly select an advertisement
	echo
	echo "** DOCKER ENGINE - ENTERPRISE **"
	echo
	SHORT_URL=""
	case $(shuf -i 0-1 -n 1) in
		0)
			echo "Test drive additional security features by activating Docker Engine - Enterprise."
			echo
			echo "  * Leverage FIPS 140-2 validated encryption"
			echo "  * Run only trusted images with digital signature enforcement"
			SHORT_URL="https://dockr.ly/engine1"
			;;
		1)
			echo "If you鈥檙e ready for production workloads, Docker Engine - Enterprise also includes:"
			echo
			echo "  * SLA-backed technical support"
			echo "  * Extended lifecycle maintenance policy for patches and hotfixes"
			echo "  * Access to certified ecosystem content"
			SHORT_URL="https://dockr.ly/engine2"
			;;
	esac
	echo
	echo "** Learn more at ${SHORT_URL} **"
	echo
	echo "ACTIVATE your own engine to Docker Engine - Enterprise using:"
	echo
	echo "  sudo docker engine activate"
	echo
	sleep 10
}

do_install() {
	echo "# Executing docker install script, commit: $SCRIPT_COMMIT_SHA"

	if command_exists docker; then
		docker_version="$(docker -v | cut -d ' ' -f3 | cut -d ',' -f1)"
		MAJOR_W=1
		MINOR_W=10

		semverParse "$docker_version"

		shouldWarn=0
		if [ "$major" -lt "$MAJOR_W" ]; then
			shouldWarn=1
		fi

		if [ "$major" -le "$MAJOR_W" ] && [ "$minor" -lt "$MINOR_W" ]; then
			shouldWarn=1
		fi

		cat >&2 <<-'EOF'
			Warning: the "docker" command appears to already exist on this system.

			If you already have Docker installed, this script can cause trouble, which is
			why we're displaying this warning and provide the opportunity to cancel the
			installation.

			If you installed the current Docker package using this script and are using it
		EOF

		if [ $shouldWarn -eq 1 ]; then
			cat >&2 <<-'EOF'
			again to update Docker, we urge you to migrate your image store before upgrading
			to v1.10+.

			You can find instructions for this here:
			https://github.com/docker/docker/wiki/Engine-v1.10.0-content-addressability-migration
			EOF
		else
			cat >&2 <<-'EOF'
			again to update Docker, you can safely ignore this message.
			EOF
		fi

		cat >&2 <<-'EOF'

			You may press Ctrl+C now to abort this script.
		EOF
		( set -x; sleep 20 )
	fi

	user="$(id -un 2>/dev/null || true)"

	sh_c='sh -c'
	if [ "$user" != 'root' ]; then
		if command_exists sudo; then
			sh_c='sudo -E sh -c'
		elif command_exists su; then
			sh_c='su -c'
		else
			cat >&2 <<-'EOF'
			Error: this installer needs the ability to run commands as root.
			We are unable to find either "sudo" or "su" available to make this happen.
			EOF
			exit 1
		fi
	fi

	if is_dry_run; then
		sh_c="echo"
	fi

	# perform some very rudimentary platform detection
	lsb_dist=$( get_distribution )
	lsb_dist="$(echo "$lsb_dist" | tr '[:upper:]' '[:lower:]')"

	case "$lsb_dist" in

		ubuntu)
			if command_exists lsb_release; then
				dist_version="$(lsb_release --codename | cut -f2)"
			fi
			if [ -z "$dist_version" ] && [ -r /etc/lsb-release ]; then
				dist_version="$(. /etc/lsb-release && echo "$DISTRIB_CODENAME")"
			fi
		;;

		debian|raspbian)
			dist_version="$(sed 's/\/.*//' /etc/debian_version | sed 's/\..*//')"
			case "$dist_version" in
				9)
					dist_version="stretch"
				;;
				8)
					dist_version="jessie"
				;;
			esac
		;;

		centos)
			if [ -z "$dist_version" ] && [ -r /etc/os-release ]; then
				dist_version="$(. /etc/os-release && echo "$VERSION_ID")"
			fi
		;;

		rhel|ol|sles)
			ee_notice "$lsb_dist"
			exit 1
			;;

		*)
			if command_exists lsb_release; then
				dist_version="$(lsb_release --release | cut -f2)"
			fi
			if [ -z "$dist_version" ] && [ -r /etc/os-release ]; then
				dist_version="$(. /etc/os-release && echo "$VERSION_ID")"
			fi
		;;

	esac

	# Check if this is a forked Linux distro
	check_forked

	# Run setup for each distro accordingly
	case "$lsb_dist" in
		ubuntu|debian|raspbian)
			pre_reqs="apt-transport-https ca-certificates curl"
			if [ "$lsb_dist" = "debian" ]; then
				# libseccomp2 does not exist for debian jessie main repos for aarch64
				if [ "$(uname -m)" = "aarch64" ] && [ "$dist_version" = "jessie" ]; then
					add_debian_backport_repo "$dist_version"
				fi
			fi

			if ! command -v gpg > /dev/null; then
				pre_reqs="$pre_reqs gnupg"
			fi
			apt_repo="deb [arch=$(dpkg --print-architecture)] $DOWNLOAD_URL/linux/$lsb_dist $dist_version $CHANNEL"
			(
				if ! is_dry_run; then
					set -x
				fi
				$sh_c 'apt-get update -qq >/dev/null'
				$sh_c "apt-get install -y -qq $pre_reqs >/dev/null"
				$sh_c "curl -fsSL \"$DOWNLOAD_URL/linux/$lsb_dist/gpg\" | apt-key add -qq - >/dev/null"
				$sh_c "echo \"$apt_repo\" > /etc/apt/sources.list.d/docker.list"
				$sh_c 'apt-get update -qq >/dev/null'
			)
			pkg_version=""
			if [ -n "$VERSION" ]; then
				if is_dry_run; then
					echo "# WARNING: VERSION pinning is not supported in DRY_RUN"
				else
					# Will work for incomplete versions IE (17.12), but may not actually grab the "latest" if in the test channel
					pkg_pattern="$(echo "$VERSION" | sed "s/-ce-/~ce~.*/g" | sed "s/-/.*/g").*-0~$lsb_dist"
					search_command="apt-cache madison 'docker-ce' | grep '$pkg_pattern' | head -1 | cut -d' ' -f 4"
					pkg_version="$($sh_c "$search_command")"
					echo "INFO: Searching repository for VERSION '$VERSION'"
					echo "INFO: $search_command"
					if [ -z "$pkg_version" ]; then
						echo
						echo "ERROR: '$VERSION' not found amongst apt-cache madison results"
						echo
						exit 1
					fi
					pkg_version="=$pkg_version"
				fi
			fi
			(
				if ! is_dry_run; then
					set -x
				fi
				$sh_c "apt-get install -y -qq --no-install-recommends docker-ce$pkg_version >/dev/null"
			)
			echo_docker_as_nonroot
			ee_promo
			exit 0
			;;
		centos|fedora)
			yum_repo="$DOWNLOAD_URL/linux/$lsb_dist/$REPO_FILE"
			if ! curl -Ifs "$yum_repo" > /dev/null; then
				echo "Error: Unable to curl repository file $yum_repo, is it valid?"
				exit 1
			fi
			if [ "$lsb_dist" = "fedora" ]; then
				pkg_manager="dnf"
				config_manager="dnf config-manager"
				enable_channel_flag="--set-enabled"
				disable_channel_flag="--set-disabled"
				pre_reqs="dnf-plugins-core"
				pkg_suffix="fc$dist_version"
			else
				pkg_manager="yum"
				config_manager="yum-config-manager"
				enable_channel_flag="--enable"
				disable_channel_flag="--disable"
				pre_reqs="yum-utils"
				pkg_suffix="el"
			fi
			(
				if ! is_dry_run; then
					set -x
				fi
				$sh_c "$pkg_manager install -y -q $pre_reqs"
				$sh_c "$config_manager --add-repo $yum_repo"

				if [ "$CHANNEL" != "stable" ]; then
					$sh_c "$config_manager $disable_channel_flag docker-ce-*"
					$sh_c "$config_manager $enable_channel_flag docker-ce-$CHANNEL"
				fi
				$sh_c "$pkg_manager makecache"
			)
			pkg_version=""
			if [ -n "$VERSION" ]; then
				if is_dry_run; then
					echo "# WARNING: VERSION pinning is not supported in DRY_RUN"
				else
					pkg_pattern="$(echo "$VERSION" | sed "s/-ce-/\\\\.ce.*/g" | sed "s/-/.*/g").*$pkg_suffix"
					search_command="$pkg_manager list --showduplicates 'docker-ce' | grep '$pkg_pattern' | tail -1 | awk '{print \$2}'"
					pkg_version="$($sh_c "$search_command")"
					echo "INFO: Searching repository for VERSION '$VERSION'"
					echo "INFO: $search_command"
					if [ -z "$pkg_version" ]; then
						echo
						echo "ERROR: '$VERSION' not found amongst $pkg_manager list results"
						echo
						exit 1
					fi
					# Cut out the epoch and prefix with a '-'
					pkg_version="-$(echo "$pkg_version" | cut -d':' -f 2)"
				fi
			fi
			(
				if ! is_dry_run; then
					set -x
				fi
				$sh_c "$pkg_manager install -y -q docker-ce$pkg_version"
			)
			echo_docker_as_nonroot
			ee_promo
			exit 0
			;;
	esac
	exit 1
}

# wrapped up in a function so that we have some protection against only getting
# half the file during "curl | sh"
do_install

docker修改默认的Docker Root Dir路径/var/lib/docker

方法一
停止docker服务,systemctl stop docker
vi /etc/docker/daemon.json
增加选项 “graph”: “/home/docker”,
启动docker服务,systemctl start docker

方法一

停止docker服务,systemctl stop docker
vi /etc/docker/daemon.json
增加选项 “graph”: “/home/docker”,
启动docker服务,systemctl start docker

示例:

方法二

cd /var/lib/
mv docker/* /home/docker
rm -rf docker
ln -s /home/docker/ /var/lib/docker

Kubernetes secret存储和管理敏感信息

Kubernetes Secret是一个包含少量敏感数据的对象,如密码,令牌或密钥,如果这些信息放到pod或image中,存在很大的安全风险。为了降低密码泄露的风险,可以创建一个secretKeyRef,并在pod定义的时候使用。

Kubernetes Secret是一个包含少量敏感数据的对象,如密码,令牌或密钥,如果这些信息放到pod或image中,存在很大的安全风险。为了降低密码泄露的风险,可以创建一个secretKeyRef,并在pod定义的时候使用。

创建

# Create files needed for rest of example.
$ echo -n 'admin' > ./username.txt
$ echo -n '1f2d1e2e67df' > ./password.txt

$ kubectl create secret generic db-user-pass --from-file=./username.txt --from-file=./password.txt
secret "db-user-pass" created

查看

kubectl get secrets
kubectl describe secrets/db-user-pass

使用

官方文档:https://kubernetes.io/docs/concepts/configuration/secret/

在Kubernetes集群中创建CronJob运行自动化任务

创建一个Cron作业
kubectl create -f https://raw.githubusercontent.com/kubernetes/website/master/content/en/examples/application/job/cronjob.yaml
apiVersion: batch/v1beta1
kind: CronJob
metadata:
name: hello
spec:
schedule: “*/1 * * * *”
jobTemplate:
spec:
template:
spec:
containers:
– name: hello
image: busybox
args:
– /bin/sh
– -c
– date; echo Hello from the Kubernetes cluster
restartPolicy: OnFailure

或者通过kubectl run方式创建

创建一个Cron作业

kubectl create -f https://raw.githubusercontent.com/kubernetes/website/master/content/en/examples/application/job/cronjob.yaml
apiVersion: batch/v1beta1
kind: CronJob
metadata:
  name: hello
spec:
  schedule: "*/1 * * * *"
  jobTemplate:
    spec:
      template:
        spec:
          containers:
          - name: hello
            image: busybox
            args:
            - /bin/sh
            - -c
            - date; echo Hello from the Kubernetes cluster
          restartPolicy: OnFailure

或者通过kubectl run方式创建

kubectl run hello --schedule="*/1 * * * *" --restart=OnFailure --image=busybox -- /bin/sh -c "date; echo Hello from the Kubernetes cluster"

查看cronjob状态及结果

kubectl get cronjob hello
kubectl get jobs --watch

删除Cron作业

kubectl delete cronjob hello

参考文档:
https://kubernetes.io/docs/tasks/job/automated-tasks-with-cron-jobs/

Kubernetes集群中部署单实例MySQL

Mysql服务属于有状态的单实例应用程序,因为/var/lib/mysql目录需要持久化存储。
我们在部署mysql服务之前,首先创建了一个查找20G卷的PersistentVolumeClaim,使用PersistentVolumeClaim将其连接到现有PersistentVolume来运行有状态应用程序。

Mysql服务属于有状态的单实例应用程序,因为/var/lib/mysql目录需要持久化存储。
我们在部署mysql服务之前,首先创建了一个查找20G卷的PersistentVolumeClaim,使用PersistentVolumeClaim将其连接到现有PersistentVolume来运行有状态应用程序。

创建PV和PVC

kubectl create -f https://k8s.io/examples/application/mysql/mysql-pv.yaml

kind: PersistentVolume
apiVersion: v1
metadata:
  name: mysql-pv-volume
  labels:
    type: local
spec:
  storageClassName: manual
  capacity:
    storage: 20Gi
  accessModes:
    - ReadWriteOnce
  hostPath:
    path: "/mnt/data"
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: mysql-pv-claim
spec:
  storageClassName: manual
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 20Gi

kubectl get pv
Kubectl get pic

创建mysql服务deployment

kubectl create -f https://k8s.io/examples/application/mysql/mysql-deployment.yaml

apiVersion: v1
kind: Service
metadata:
  name: mysql
spec:
  ports:
  - port: 3306
  selector:
    app: mysql
  clusterIP: None
---
apiVersion: apps/v1 # for versions before 1.9.0 use apps/v1beta2
kind: Deployment
metadata:
  name: mysql
spec:
  selector:
    matchLabels:
      app: mysql
  strategy:
    type: Recreate
  template:
    metadata:
      labels:
        app: mysql
    spec:
      containers:
      - image: mysql:5.6
        name: mysql
        env:
          # Use secret in real usage
        - name: MYSQL_ROOT_PASSWORD
          value: password
        ports:
        - containerPort: 3306
          name: mysql
        volumeMounts:
        - name: mysql-persistent-storage
          mountPath: /var/lib/mysql
      volumes:
      - name: mysql-persistent-storage
        persistentVolumeClaim:
          claimName: mysql-pv-claim

kubectl get pods -l app=mysql
kubectl describe deployment mysql

使用客户端链接mysql

kubectl run -it --rm --image=mysql:5.6 --restart=Never mysql-client -- mysql -h mysql -ppassword

删除服务及存储

kubectl delete deployment,svc mysql
kubectl delete pvc mysql-pv-claim
kubectl delete pv mysql-pv-volume

参考文档:
https://kubernetes.io/docs/tasks/run-application/run-single-instance-stateful-application/

世界,您好!

The following variables are available to shell scriptsBRANCH_NAMEFor a multibranch project, this will be set to the name of the branch being built, for example in case you wish to deploy to production from master but not from feature branches; if corresponding to some kind of change request, the name is generally arbitrary (refer to CHANGE_ID and CHANGE_TARGET).CHANGE_IDFor a multibranch project corresponding to some kind of change request, this will be set to the change ID, such as a pull request number, if supported; else unset.CHANGE_URLFor a multibranch project corresponding to some kind of change request, this will be set to the change URL, if supported; else unset.CHANGE_TITLEFor a multibranch project corresponding to some kind of change request, this will be set to the title of the change, if supported; else unset.CHANGE_AUTHORFor a multibranch project corresponding to some kind of change request, this will be set to the username of the author of the proposed change, if supported; else unset.CHANGE_AUTHOR_DISPLAY_NAMEFor a multibranch project corresponding to some kind of change request, this will be set to the human name of the author, if supported; else unset.CHANGE_AUTHOR_EMAILFor a multibranch project corresponding to some kind of change request, this will be set to the email address of the author, if supported; else unset.CHANGE_TARGETFor a multibranch project corresponding to some kind of change request, this will be set to the target or base branch to which the change could be merged, if supported; else unset.BUILD_NUMBERThe current build number, such as “153”BUILD_IDThe current build ID, identical to BUILD_NUMBER for builds created in 1.597+, but a YYYY-MM-DD_hh-mm-ss timestamp for older buildsBUILD_DISPLAY_NAMEThe display name of the current build, which is something like “#153” by default.JOB_NAMEName of the project of this build, such as “foo” or “foo/bar”.JOB_BASE_NAMEShort Name of the project of this build stripping off folder paths, such as “foo” for “bar/foo”.BUILD_TAGString of “jenkins-${JOB_NAME}${BUILD_NUMBER}“. All forward slashes (“/”) in the JOB_NAME are replaced with dashes (“-“). Convenient to put into a resource file, a jar file, etc for easier identification.EXECUTOR_NUMBERThe unique number that identifies the current executor (among executors of the same machine) that’s carrying out this build. This is the number you see in the “build executor status”, except that the number starts from 0, not 1.NODE_NAMEName of the agent if the build is on an agent, or “master” if run on masterNODE_LABELSWhitespace-separated list of labels that the node is assigned.WORKSPACEThe absolute path of the directory assigned to the build as a workspace.JENKINS_HOMEThe absolute path of the directory assigned on the master node for Jenkins to store data.JENKINS_URLFull URL of Jenkins, like http://server:port/jenkins/ (note: only available if Jenkins URL set in system configuration)BUILD_URLFull URL of this build, like http://server:port/jenkins/job/foo/15/ (Jenkins URL must be set)JOB_URLFull URL of this job, like http://server:port/jenkins/job/foo/ (Jenkins URL must be set)GIT_COMMITThe commit hash being checked out.GIT_PREVIOUS_COMMITThe hash of the commit last built on this branch, if any.GIT_PREVIOUS_SUCCESSFUL_COMMITThe hash of the commit last successfully built on this branch, if any.GIT_BRANCHThe remote branch name, if any.GIT_LOCAL_BRANCHThe local branch name being checked out, if applicable.GIT_URLThe remote URL. If there are multiple, will be GIT_URL_1GIT_URL_2, etc.GIT_COMMITTER_NAMEThe configured Git committer name, if any.GIT_AUTHOR_NAMEThe configured Git author name, if any.GIT_COMMITTER_EMAILThe configured Git committer email, if any.GIT_AUTHOR_EMAILThe configured Git author email, if any.SVN_REVISIONSubversion revision number that’s currently checked out to the workspace, such as “12345”SVN_URLSubversion URL that’s currently checked out to the workspace.