62 lines
1.6 KiB
Bash
62 lines
1.6 KiB
Bash
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#!/bin/bash
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WD=/var/run/resolvconf/
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CONFIG_DIR=${WD}/interface/
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STATIC_CONFIG_FILE=mgmt.static
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DYNAMIC_CONFIG_FILE_TEMPLATE=*.dhclient
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update_symlink()
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{
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ln -sf /run/resolvconf/resolv.conf /etc/resolv.conf
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}
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start()
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{
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update_symlink
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redis-dump -d 4 -k "DNS_NAMESERVER*" -y > /tmp/dns.json
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if [[ $? -eq 0 && "$(cat /tmp/dns.json)" != "{}" ]]; then
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# Apply static DNS configuration and disable updates
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/sbin/resolvconf --disable-updates
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pushd ${CONFIG_DIR}
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# Backup dynamic configuration to restore it when the static configuration is removed
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mv ${DYNAMIC_CONFIG_FILE_TEMPLATE} ${WD} || true
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sonic-cfggen -d -t /usr/share/sonic/templates/resolv.conf.j2,${STATIC_CONFIG_FILE}
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/sbin/resolvconf --enable-updates
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/sbin/resolvconf -u
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/sbin/resolvconf --disable-updates
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popd
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else
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# Dynamic DNS configuration. Enable updates. It is expected to receive configuraution for DHCP server
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/sbin/resolvconf --disable-updates
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pushd ${CONFIG_DIR}
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rm -f ${STATIC_CONFIG_FILE}
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# Restore dynamic configuration if it exists
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mv ${WD}/${DYNAMIC_CONFIG_FILE_TEMPLATE} ${CONFIG_DIR} || true
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/sbin/resolvconf --enable-updates
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/sbin/resolvconf -u
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fi
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}
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clean-dynamic-conf()
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{
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rm -f ${WD}/${DYNAMIC_CONFIG_FILE_TEMPLATE}
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rm -f ${WD}/postponed-update
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}
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case $1 in
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start)
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start
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;;
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cleanup)
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clean-dynamic-conf
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;;
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*)
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echo "Usage: $0 {start|clean-dynamic-conf}"
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exit 2
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;;
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esac
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