mirror of
https://github.com/nginx-proxy/nginx-proxy
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46 lines
1.7 KiB
Bash
Executable File
46 lines
1.7 KiB
Bash
Executable File
#!/bin/bash -e
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# The first argument is the bit depth of the dhparam, or 2048 if unspecified
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DHPARAM_BITS=${1:-2048}
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# If a dhparam file is not available, use the pre-generated one and generate a new one in the background.
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# Note that /etc/nginx/dhparam is a volume, so this dhparam will persist restarts.
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PREGEN_DHPARAM_FILE="/app/dhparam.pem.default"
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DHPARAM_FILE="/etc/nginx/dhparam/dhparam.pem"
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GEN_LOCKFILE="/tmp/dhparam_generating.lock"
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# The hash of the pregenerated dhparam file is used to check if the pregen dhparam is already in use
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PREGEN_HASH=$(md5sum $PREGEN_DHPARAM_FILE | cut -d" " -f1)
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if [[ -f $DHPARAM_FILE ]]; then
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CURRENT_HASH=$(md5sum $DHPARAM_FILE | cut -d" " -f1)
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if [[ $PREGEN_HASH != $CURRENT_HASH ]]; then
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# There is already a dhparam, and it's not the default
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echo "Custom dhparam.pem file found, generation skipped"
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exit 0
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fi
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if [[ -f $GEN_LOCKFILE ]]; then
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# Generation is already in progress
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exit 0
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fi
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fi
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cat >&2 <<-EOT
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WARNING: $DHPARAM_FILE was not found. A pre-generated dhparam.pem will be used for now while a new one
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is being generated in the background. Once the new dhparam.pem is in place, nginx will be reloaded.
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EOT
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# Put the default dhparam file in place so we can start immediately
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cp $PREGEN_DHPARAM_FILE $DHPARAM_FILE
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touch $GEN_LOCKFILE
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# Generate a new dhparam in the background in a low priority and reload nginx when finished (grep removes the progress indicator).
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(
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(
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nice -n +5 openssl dhparam -out $DHPARAM_FILE $DHPARAM_BITS 2>&1 \
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&& echo "dhparam generation complete, reloading nginx" \
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&& nginx -s reload
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) | grep -vE '^[\.+]+'
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rm $GEN_LOCKFILE
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) &disown
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