Question 82243 in Docker Question posted in
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cron service not starting post docker run and container is getting exit

tried running cron through dockerfile but when running the container its getting exit. Below is my dockerfile and error. Any help would be really appreciated

Error:

docker: Error response from daemon: OCI runtime create failed: container_linux.go:380: starting container process caused: exec: "cron": executable file not found in $PATH: unknown.

Dockerfile:

# Pull base image.
FROM amazonlinux:2

ARG TERRAFORM_VERSION=1.2.6

RUN 
yum update -y && 
yum install unzip -y && 
yum install wget -y && 
yum install vim -y 
yum install bash -y

################################
# Install Terraform
################################

# Download terraform for linux
RUN wget https://releases.hashicorp.com/terraform/${TERRAFORM_VERSION}/terraform_${TERRAFORM_VERSION}_linux_amd64.zip

RUN unzip terraform_${TERRAFORM_VERSION}_linux_amd64.zip

RUN mv terraform /usr/local/bin/


################################
# Install python
################################

RUN yum install -y python3-pip
RUN pip3 install --upgrade pip


################################
# Install AWS CLI
################################
RUN pip install awscli --upgrade --user

# add aws cli location to path
ENV PATH=~/.local/bin:$PATH


RUN mkdir ~/.aws && touch ~/.aws/credentials


################################
# Install Cron
################################

RUN yum -y install ca-certificates shadow-utils cronie && yum -y clean all

# Creating crontab
COPY  ./automation.sh /var/automation.sh


# Giving executable permission to script file.
RUN chmod +x /var/automation.sh 
    && echo "* * * * *  /bin/bash /var/automation.sh" >> /var/crontab


# Ensure sudo group users are not asked for a password
RUN echo '%sudo ALL=(ALL) NOPASSWD:ALL' >> 
/etc/sudoers

#run cron process through cmd

CMD ["cron", "-f"]
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2

Answers


  1. Chosen as BEST ANSWER
    0

    Anyone looking for answer to this, I had to change the approach a bit of running cron and it worked finally. Here is the dockerfile with updated approach.

    # Pull base image.
FROM amazonlinux:2

ARG TERRAFORM_VERSION=1.2.6

################################
# Install Dependencies
################################
RUN yum update -y && yum -y install unzip wget vim bash procps python3-pip jq git && pip3 install --upgrade pip

################################
# Install AWS CLI
################################
RUN pip install awscli --upgrade --user

# add aws cli location to path
ENV PATH=~/.local/bin:$PATH
RUN mkdir ~/.aws && touch ~/.aws/credentials

################################
# Install Terraform
################################
# Download terraform for linux
RUN wget https://releases.hashicorp.com/terraform/${TERRAFORM_VERSION}/terraform_${TERRAFORM_VERSION}_linux_amd64.zip

RUN unzip terraform_${TERRAFORM_VERSION}_linux_amd64.zip

RUN mv terraform /usr/local/bin/

################################
# Install Cron
################################
RUN yum -y install ca-certificates shadow-utils cronie && yum -y clean all

# Creating crontab
COPY  ./automation.sh /var/automation.sh


# Giving executable permission to script file.
RUN chmod +x /var/automation.sh 
    && echo "* * * * *  /bin/bash /var/automation.sh" >> /var/crontab

RUN crontab /var/crontab

# Ensure sudo group users are not asked for a password
RUN echo '%sudo ALL=(ALL) NOPASSWD:ALL' >> 
/etc/sudoers

#run cron process through cmd
CMD ["/usr/sbin/crond", "-n"]

  2. 0

    Update the CMD to this:

    CMD ["/usr/bin/crontab", "/var/crontab"]
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