我尝试在docker image“ jenkinsci / blueocean”中添加crontab,但是之后,jenkins无法启动。问题可能出在哪里? 非常感谢您的任何帮助。
<Dockerfile>
FROM jenkinsci/blueocean:1.17.0
USER root
ENV SUPERCRONIC_URL=https://github.com/aptible/supercronic/releases/download/v0.1.9/supercronic-linux-amd64 \
SUPERCRONIC=supercronic-linux-amd64 \
SUPERCRONIC_SHA1SUM=5ddf8ea26b56d4a7ff6faecdd8966610d5cb9d85
RUN curl -fsSLO "$SUPERCRONIC_URL" \
&& echo "${SUPERCRONIC_SHA1SUM} ${SUPERCRONIC}" | sha1sum -c - \
&& chmod +x "$SUPERCRONIC" \
&& mv "$SUPERCRONIC" "/usr/local/bin/${SUPERCRONIC}" \
&& ln -s "/usr/local/bin/${SUPERCRONIC}" /usr/local/bin/supercronic
ADD crontab /etc/crontab
CMD ["supercronic", "/etc/crontab"]
<crontab>
# Run every minute
*/1 * * * * echo "hello world"
commands:
$docker build -t jenkins_test .
$docker run -it -p 8080:8080 --name=container_jenkins jenkins_test
答案 0 :(得分:0)
如果使用docker inspect jenkinsci/blueocean:1.17.0
,则其入口点是:
"Entrypoint": [
"/sbin/tini",
"--",
"/usr/local/bin/jenkins.sh"
],
因此,启动容器时,它将首先执行下一个脚本。
/usr/local/bin/jenkins.sh:
#! /bin/bash -e
: "${JENKINS_WAR:="/usr/share/jenkins/jenkins.war"}"
: "${JENKINS_HOME:="/var/jenkins_home"}"
touch "${COPY_REFERENCE_FILE_LOG}" || { echo "Can not write to ${COPY_REFERENCE_FILE_LOG}. Wrong volume permissions?"; exit 1; }
echo "--- Copying files at $(date)" >> "$COPY_REFERENCE_FILE_LOG"
find /usr/share/jenkins/ref/ \( -type f -o -type l \) -exec bash -c '. /usr/local/bin/jenkins-support; for arg; do copy_reference_file "$arg"; done' _ {} +
# if `docker run` first argument start with `--` the user is passing jenkins launcher arguments
if [[ $# -lt 1 ]] || [[ "$1" == "--"* ]]; then
# read JAVA_OPTS and JENKINS_OPTS into arrays to avoid need for eval (and associated vulnerabilities)
java_opts_array=()
while IFS= read -r -d '' item; do
java_opts_array+=( "$item" )
done < <([[ $JAVA_OPTS ]] && xargs printf '%s\0' <<<"$JAVA_OPTS")
readonly agent_port_property='jenkins.model.Jenkins.slaveAgentPort'
if [ -n "${JENKINS_SLAVE_AGENT_PORT:-}" ] && [[ "${JAVA_OPTS:-}" != *"${agent_port_property}"* ]]; then
java_opts_array+=( "-D${agent_port_property}=${JENKINS_SLAVE_AGENT_PORT}" )
fi
if [[ "$DEBUG" ]] ; then
java_opts_array+=( \
'-Xdebug' \
'-Xrunjdwp:server=y,transport=dt_socket,address=5005,suspend=y' \
)
fi
jenkins_opts_array=( )
while IFS= read -r -d '' item; do
jenkins_opts_array+=( "$item" )
done < <([[ $JENKINS_OPTS ]] && xargs printf '%s\0' <<<"$JENKINS_OPTS")
exec java -Duser.home="$JENKINS_HOME" "${java_opts_array[@]}" -jar ${JENKINS_WAR} "${jenkins_opts_array[@]}" "$@"
fi
# As argument is not jenkins, assume user want to run his own process, for example a `bash` shell to explore this image
exec "$@"
从上面的脚本中,您可以看到,如果将CMD ["supercronic", "/etc/crontab"]
添加到自己的dockerfile中,那么当您的容器启动时,它就等于执行下一个:
/usr/local/bin/jenkins.sh "supercronic" "/etc/crontab"
由于if [[ $# -lt 1 ]] || [[ "$1" == "--"* ]]; then
不匹配,它将直接在最后一行执行exec "$@
,这将导致jenkins start code
永远不会执行。
要修复此问题,您必须使用自己的docker-entrypoint.sh
覆盖其默认入口点:
docker-entrypoint.sh:
#!/bin/bash
supercronic /etc/crontab &
/usr/local/bin/jenkins.sh
Dockerfile:
FROM jenkinsci/blueocean:1.17.0
USER root
ENV SUPERCRONIC_URL=https://github.com/aptible/supercronic/releases/download/v0.1.9/supercronic-linux-amd64 \
SUPERCRONIC=supercronic-linux-amd64 \
SUPERCRONIC_SHA1SUM=5ddf8ea26b56d4a7ff6faecdd8966610d5cb9d85
RUN curl -fsSLO "$SUPERCRONIC_URL" \
&& echo "${SUPERCRONIC_SHA1SUM} ${SUPERCRONIC}" | sha1sum -c - \
&& chmod +x "$SUPERCRONIC" \
&& mv "$SUPERCRONIC" "/usr/local/bin/${SUPERCRONIC}" \
&& ln -s "/usr/local/bin/${SUPERCRONIC}" /usr/local/bin/supercronic
ADD crontab /etc/crontab
COPY docker-entrypoint.sh /
RUN chmod +x /docker-entrypoint.sh
ENTRYPOINT ["/sbin/tini", "--", "/docker-entrypoint.sh"]