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abn/heredoc-dockerfile.snip

Last active July 31, 2024 06:26
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Dockerfile alternatives for heredoc
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heredoc-dockerfile.snip
#printf
RUN printf '#!/bin/bash\n\
echo hello world from line 1\n\
echo hello world from line 2'\
>> /tmp/hello
#echo
RUN echo -e '#!/bin/bash\n\
echo hello world from line 1\n\
echo hello world from line 2'\
>> /tmp/hello
@image72
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image72 commented Jul 31, 2024 

FROM debian
RUN <<EOT bash
  set -eux
  to_install=(
    vim
  )
  apt-get update
  failing_command # set -e exit with non-zero status 
  apt-get install -y "\${to_install[@]}"
EOT

# execute list shell
RUN <<EOF
apt-get update
apt-get upgrade -y
apt-get install -y ...
EOF

# run python
RUN <<EOF
#!/usr/bin/env python3
with open("/hello", "w") as f:
    print("Hello", file=f)
    print("World", file=f)
EOF

# create index.html
COPY <<EOF /usr/share/nginx/html/index.html
<html>hello, index</html>
EOF

# create /etc/mysql/my.cnf
RUN <<-EOF > /etc/mysql/my.cnf
[mysqld]
user=root
datadir=/app/mysql
port=3306
log-bin=/app/mysql/mysql-bin
EOF

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