hook-docker: bracket IPv6 hosts in dockerd syslog log driver URL#328
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Bare IPv6 addresses passed via the `syslog_host=` kernel cmdline were not bracketed in the dockerd syslog log driver URL, producing a malformed value that dockerd cannot parse. Use net.JoinHostPort so IPv6 is bracketed correctly (e.g. `udp://[fd00:80:66::1]:514`); IPv4 and hostname inputs are unchanged. Also skip configuring the syslog log driver when the syslog host is empty. Signed-off-by: Rahul Ganesh <rahulbabu95@gmail.com> Signed-off-by: Rahul <rahulbabu95@gmail.com>
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Bare IPv6 addresses passed via the
syslog_host=kernel cmdline were not bracketed in the dockerd syslog log driver URL, producing a malformed value that dockerd cannot parse. Use net.JoinHostPort so IPv6 is bracketed correctly (e.g.udp://[fd00:80:66::1]:514); IPv4 and hostname inputs are unchanged.Also skip configuring the syslog log driver when the syslog host is empty.
Description
Fixes: #
How Has This Been Tested?
When syslod_host is set to ipv6 address like syslog_host=fd00:80:66::1,
/etc/docker/daemon.json
{
"debug": true,
"log-driver": "syslog",
"log-opts": {
"syslog-address": "udp://fd00:80:66::1:514"
}
}
dockerd crashes with:
After the fix:
{
"debug": true,
"log-driver": "syslog",
"log-opts": {
"syslog-address": "udp://[fd00:80:66::1]:514"
}
}
dockerd is able to initialize properly.
How are existing users impacted? What migration steps/scripts do we need?
Checklist:
I have: