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July 31, 2024 06:26
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Dockerfile alternatives for heredoc
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| #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 |
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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kudos @maxx27! I was banging my head why in 2024 it still has to be so difficult to use heredocs in Dockerfiles in a reasonable way. That last snippet of yours is the way to go! Thanks!