Alpine: grep not found

[cyrilfr]

I base my docker on openjdk:alpine and the grep package is broken. I have to do apk fix grep to get it works. Otherwise, I get "grep not found" when I try to use it.

[wglambert]

Can you give all the commands you ran and any relevant contextual information or files for reproducing the issue

I'm not able to reproduce

$ docker run --rm -dit --name openjdk openjdk:alpine
$ docker exec -it openjdk sh
# cd etc
# ls
TZ                    krb5.conf             profile
alpine-release        localtime             profile.d
apk                   logrotate.d           protocols
ca-certificates       modprobe.d            resolv.conf
ca-certificates.conf  modules               securetty
conf.d                modules-load.d        services
crontabs              motd                  shadow
fstab                 mtab                  shells
group                 network               ssl
hostname              opt                   sysctl.conf
hosts                 os-release            sysctl.d
init.d                passwd                udhcpd.conf
inittab               periodic
issue                 pkcs11
# which grep
/bin/grep
# cat profile
export CHARSET=UTF-8
export PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
export PAGER=less
export PS1='\h:\w\$ '
umask 022

for script in /etc/profile.d/*.sh ; do
        if [ -r $script ] ; then
                . $script
        fi
done
# grep export profile
export CHARSET=UTF-8
export PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
export PAGER=less
export PS1='\h:\w\$ '

[cyrilfr]

Sure, here is my Dockerfile:

FROM openjdk:alpine
RUN ["apk", "--update", "add", "bash"]
WORKDIR /opt/docker
ADD opt /opt
RUN ["chown", "-R", "root:root", "."]
EXPOSE 80 443
RUN ["mkdir", "-p", "/opt/docker/ipk", "/opt/docker/images", "/opt/docker/v11", "/etc/letsencrypt"]
RUN ["chown", "-R", "root:root", "/opt/docker/ipk", "/opt/docker/images", "/opt/docker/v11", "/etc/letsencrypt"]
VOLUME ["/opt/docker/ipk", "/opt/docker/images", "/opt/docker/v11", "/etc/letsencrypt"]
USER root
ENTRYPOINT ["bin/vestaweblavorent"]
CMD ["-Dconfig.resource=prod.conf", "-Dpidfile.path=/dev/null", "-J-Xmx2G"]
RUN ["apk", "fix", "grep"]
RUN ["apk", "add", "ca-certificates"]
RUN ["apk", "add", "tzdata"]
RUN ["cp", "/usr/share/zoneinfo/Europe/Zurich", "/etc/localtime"]
RUN ["apk", "add", "ttf-freefont"]

The container is run by Jelastic.

[tianon]

Sounds like it could be a corrupted image; have you tried deleting all the layers and re-pulling?

[cyrilfr]

Yes I did it with:

service docker stop
sudo rm -rf /var/lib/docker
service docker start

and

docker rmi $(docker images -a)

After that I pull the layers and push my image to Docker Hub with SBT and the sbt-native-packager:

sbt docker:publish

I get this output at run:

-ash: grep: not found 
-ash: grep: not found 
-ash: grep: not found 
-ash: grep: not found
-ash: grep: not found
-ash: grep: not found 
-ash: grep: not found 
-ash: grep: not found 
-ash: grep: not found
-ash: grep: not found 
-ash: grep: not found 
-ash: grep: not found 
mesg: not a tty 
-ash: /etc/profile: line 40: grep: not found 
-ash: /etc/profile: line 1: grep: not found 
-ash: /etc/profile: line 1: grep: not found
-ash: /etc/profile: line 1: grep: not found 
-ash: /etc/profile: line 1: grep: not found 
-ash: /etc/profile: line 1: grep: not found 
-ash: /etc/profile: line 1: grep: not found 
-ash: /etc/profile: line 1: grep: not found 
-ash: /etc/profile: line 1: grep: not found 
-ash: /etc/profile: line 1: grep: not found 
-ash: /etc/profile: line 1: grep: not found 
-ash: /etc/profile: line 1: grep: not found
[[37minfo[0m] application - Creating Pool for datasource 'default' 
[[37minfo[0m] p.a.d.DefaultDBApi - Database [default] connected at jdbc:mariadb://10.102.0.88/vesta
[[37minfo[0m] play.api.Play - Application started (Prod)
[[37minfo[0m] p.c.s.NettyServer - Listening for HTTP on /0:0:0:0:0:0:0:0:80
[[37minfo[0m] p.c.s.NettyServer - Listening for HTTPS on /0:0:0:0:0:0:0:0:443

[wglambert]

I modified the Dockerfile so that it will build for me

FROM openjdk:alpine
RUN ["apk", "--update", "add", "bash"]
WORKDIR /opt/docker
ADD opt /opt
RUN ["chown", "-R", "root:root", "."]
EXPOSE 80 443
RUN ["mkdir", "-p", "/opt/docker/ipk", "/opt/docker/images", "/opt/docker/v11", "/etc/letsencrypt"]
RUN ["chown", "-R", "root:root", "/opt/docker/ipk", "/opt/docker/images", "/opt/docker/v11", "/etc/letsencrypt"]
VOLUME ["/opt/docker/ipk", "/opt/docker/images", "/opt/docker/v11", "/etc/letsencrypt"]
USER root
#ENTRYPOINT ["bin/vestaweblavorent"]
#CMD ["-D config.resource=prod.conf", "-D pidfile.path=/dev/null", "-J -Xmx2G"]
RUN ["apk", "fix", "grep"]
RUN ["apk", "add", "ca-certificates"]
RUN ["apk", "add", "tzdata"]
RUN ["cp", "/usr/share/zoneinfo/Europe/Zurich", "/etc/localtime"]
RUN ["apk", "add", "ttf-freefont"]

Grep works as expected in the image

$ docker run --rm -dit --name openjdk_test -it openjdk_test
$ docker exec -it openjdk_test ash

/opt/docker # cd /
/ # ls
bin    etc    lib    mnt    proc   run    srv    tmp    var
dev    home   media  opt    root   sbin   sys    usr
/ # cd etc
/etc # grep export profile
export CHARSET=UTF-8
export PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
export PAGER=less
export PS1='\h:\w\$ '

[cyrilfr]

What if you remove this line?

RUN ["apk", "fix", "grep"]

I'm in contact with the Jelastic team.

[wglambert]

Ah, I missed that line

FROM openjdk:alpine
RUN ["apk", "--update", "add", "bash"]
WORKDIR /opt/docker
ADD opt /opt
RUN ["chown", "-R", "root:root", "."]
EXPOSE 80 443
RUN ["mkdir", "-p", "/opt/docker/ipk", "/opt/docker/images", "/opt/docker/v11", "/etc/letsencrypt"]
RUN ["chown", "-R", "root:root", "/opt/docker/ipk", "/opt/docker/images", "/opt/docker/v11", "/etc/letsencrypt"]
VOLUME ["/opt/docker/ipk", "/opt/docker/images", "/opt/docker/v11", "/etc/letsencrypt"]
USER root
#ENTRYPOINT ["bin/vestaweblavorent"]
#CMD ["-D config.resource=prod.conf", "-D pidfile.path=/dev/null", "-J -Xmx2G"]
#RUN ["apk", "fix", "grep"]
RUN ["apk", "add", "ca-certificates"]
RUN ["apk", "add", "tzdata"]
RUN ["cp", "/usr/share/zoneinfo/Europe/Zurich", "/etc/localtime"]
RUN ["apk", "add", "ttf-freefont"]

Seems that grep doesn't show any abnormal behavior from what I can find

$ docker run --rm -dit --name openjdk_test -it openjdk_test
$ docker exec -it openjdk_test ash

/opt/docker # grep export /etc/profile
export CHARSET=UTF-8
export PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
export PAGER=less
export PS1='\h:\w\$ '

[ihorman]

Hi, please try that
ln -sf /bin/busybox /bin/grep
That will help. There was an issue caused by installing of standalone grep package into container (as far as default one, that is going with busybox doesn't have all required flags suported, that are required by Jelastic to manage the container and make all the features available). The standalone binary that came with "apk add --update grep" wasn't operable so rolling back to busybox is a best option for now.
This bug is going to be fixed soon, sorry for that inconvenience.

[tianon]

Cool, thanks for tracking this down for us, @ihorman!

Since this isn't an issue with the image, I'm going to close. 👍

[ihorman]

@tianon, thank you too :)
@cyrilfr, thank you for reporting a problem, just wanted to let you know the issue is fixed on a Jelastic side.