Hello,
I have a question. I am trying to read journald log files within
a docker container on a host that is using systemd.
Inside the container, systemd is NOT running. I want to use a
library that uses the sd-journal API to read the logs within the
container.
I tried the following docker cmd:
docker run --rm --interactive --tty \
--net host \
--privileged \
-v /run:/run \
-v /var:/var \
--mount
type=bind,source=/sys/fs/cgroup,target=/sys/fs/cgroup \
--mount
type=bind,source=/sys/fs/fuse,target=/sys/fs/fuse \
myContainer:latest
When running my code inside this container, though, the log files
are always empty.
Running the same code on my host machine correctly yields the log
files.
I know that just mounting whole /var and --privileged are bad.
This is just a proof of concept.
What am I missing to make this work?
In case its important, this is my code to read log files (library is go-systemd/sdjournal)
jr, err :=
sdjournal.NewJournalReader(sdjournal.JournalReaderConfig{})
if err != nil {
return
}
buf := make([]byte, 1024)
n, err := jr.Read(buf)
if err != nil {
if n > 0 {
println(string(buf[:n]))
}
if err == io.EOF {
println("EOF")
err = nil
}
return
}
println(string(buf[:n]))
I also tried to supply the path to the log dir:
"/var/log/journal/<machine-id>" in the reader conf, but the
result was the same.
Kind regards,
Sebastian
P.S.: This is my first message on this mailing list, sorry if I
missed any rule or best practice.
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