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SSHd logs in Docker container not shown by `docker logs`


Why isn't ifconfig available in Ubuntu Docker container?Clearing/Deleting Docker LogsDocker Container time & timezone (will not reflect changes)Docker container SSHOpen not staying upHow to forward Docker container logs to ELK?'docker logs' throws error when trying to access an exited containerStarting sshd in a Centos 7 OS Docker Container on docker run using both ENTRYPOINT and CMDDocker container logs not rollingSee docker container logs on host while using gelf driverUnable to ssh into running dropbear sshd. “Bad password attempt” …But password is correct






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2















When using



CMD ["/usr/sbin/sshd", "-D"]


in a Dockerfile, docker logs does not show the logging:



cat > Dockerfile.stdout <<EOF
FROM alpine:latest
RUN apk add --no-cache openssh-server
&& mkdir /var/run/sshd
&& ssh-keygen -A
CMD ["/usr/sbin/sshd", "-D"]
EOF

docker build -f Dockerfile.stdout -t sshd-stdout .

docker run --name sshd-stdout -d sshd-stdout

docker logs sshd-stdout
<empty>


Docker host is CentOS:



cat /etc/redhat-release
CentOS Linux release 7.6.1810 (Core)


Docker logging backend is journald:



grep ^OPTIONS /etc/sysconfig/docker
OPTIONS='--selinux-enabled --log-driver=journald --signature-verification=false'


I also tried using json as a logging backend, without success.



How do I 'forward' the logging correctly?










share|improve this question




























    2















    When using



    CMD ["/usr/sbin/sshd", "-D"]


    in a Dockerfile, docker logs does not show the logging:



    cat > Dockerfile.stdout <<EOF
    FROM alpine:latest
    RUN apk add --no-cache openssh-server
    && mkdir /var/run/sshd
    && ssh-keygen -A
    CMD ["/usr/sbin/sshd", "-D"]
    EOF

    docker build -f Dockerfile.stdout -t sshd-stdout .

    docker run --name sshd-stdout -d sshd-stdout

    docker logs sshd-stdout
    <empty>


    Docker host is CentOS:



    cat /etc/redhat-release
    CentOS Linux release 7.6.1810 (Core)


    Docker logging backend is journald:



    grep ^OPTIONS /etc/sysconfig/docker
    OPTIONS='--selinux-enabled --log-driver=journald --signature-verification=false'


    I also tried using json as a logging backend, without success.



    How do I 'forward' the logging correctly?










    share|improve this question
























      2












      2








      2








      When using



      CMD ["/usr/sbin/sshd", "-D"]


      in a Dockerfile, docker logs does not show the logging:



      cat > Dockerfile.stdout <<EOF
      FROM alpine:latest
      RUN apk add --no-cache openssh-server
      && mkdir /var/run/sshd
      && ssh-keygen -A
      CMD ["/usr/sbin/sshd", "-D"]
      EOF

      docker build -f Dockerfile.stdout -t sshd-stdout .

      docker run --name sshd-stdout -d sshd-stdout

      docker logs sshd-stdout
      <empty>


      Docker host is CentOS:



      cat /etc/redhat-release
      CentOS Linux release 7.6.1810 (Core)


      Docker logging backend is journald:



      grep ^OPTIONS /etc/sysconfig/docker
      OPTIONS='--selinux-enabled --log-driver=journald --signature-verification=false'


      I also tried using json as a logging backend, without success.



      How do I 'forward' the logging correctly?










      share|improve this question














      When using



      CMD ["/usr/sbin/sshd", "-D"]


      in a Dockerfile, docker logs does not show the logging:



      cat > Dockerfile.stdout <<EOF
      FROM alpine:latest
      RUN apk add --no-cache openssh-server
      && mkdir /var/run/sshd
      && ssh-keygen -A
      CMD ["/usr/sbin/sshd", "-D"]
      EOF

      docker build -f Dockerfile.stdout -t sshd-stdout .

      docker run --name sshd-stdout -d sshd-stdout

      docker logs sshd-stdout
      <empty>


      Docker host is CentOS:



      cat /etc/redhat-release
      CentOS Linux release 7.6.1810 (Core)


      Docker logging backend is journald:



      grep ^OPTIONS /etc/sysconfig/docker
      OPTIONS='--selinux-enabled --log-driver=journald --signature-verification=false'


      I also tried using json as a logging backend, without success.



      How do I 'forward' the logging correctly?







      ssh logging docker stdout






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked Feb 5 at 13:56









      WillemWillem

      4517




      4517




















          1 Answer
          1






          active

          oldest

          votes


















          0














          Use -e command-line option to forward all messages to standard error (from sshd docs):




          -e Write debug logs to standard error instead of the system log.




          I found a good example in the following Docker file:



          simple alpine based SSHD server






          share|improve this answer























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            1 Answer
            1






            active

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            active

            oldest

            votes






            active

            oldest

            votes









            0














            Use -e command-line option to forward all messages to standard error (from sshd docs):




            -e Write debug logs to standard error instead of the system log.




            I found a good example in the following Docker file:



            simple alpine based SSHD server






            share|improve this answer



























              0














              Use -e command-line option to forward all messages to standard error (from sshd docs):




              -e Write debug logs to standard error instead of the system log.




              I found a good example in the following Docker file:



              simple alpine based SSHD server






              share|improve this answer

























                0












                0








                0







                Use -e command-line option to forward all messages to standard error (from sshd docs):




                -e Write debug logs to standard error instead of the system log.




                I found a good example in the following Docker file:



                simple alpine based SSHD server






                share|improve this answer













                Use -e command-line option to forward all messages to standard error (from sshd docs):




                -e Write debug logs to standard error instead of the system log.




                I found a good example in the following Docker file:



                simple alpine based SSHD server







                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered May 6 at 20:56









                marioavsmarioavs

                1




                1



























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