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service: use the logging system with runc

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If external logging is enabled, this patch sets the stdout and stderr
of the `runc` invocations to one end of a socketpair and the other end is
sent to the logging service. Otherwise we log to files as before.

Signed-off-by: David Scott <dave.scott@docker.com>
This commit is contained in:
David Scott 2018-07-01 12:08:46 +01:00
parent 4dc75bc67b
commit f4bbce7a6c
1 changed files with 13 additions and 17 deletions
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30
pkg/init/cmd/service/runc.go
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@ -62,6 +62,8 @@ func runcInit(rootPath, serviceType string) int {
log.Fatalf("Cannot create log directory %s: %v", logDir, err)
}
logger := GetLog(logDir)
for _, file := range files {
name := file.Name()
path := filepath.Join(rootPath, name)
@ -76,23 +78,19 @@ func runcInit(rootPath, serviceType string) int {
pidfile := filepath.Join(tmpdir, name)
cmd := exec.Command(runcBinary, "create", "--bundle", path, "--pid-file", pidfile, name)
// stream stdout and stderr to respective files
// ideally we want to use io.MultiWriter here, sending one stream to stdout/stderr, another to the files
// however, this hangs if we do, due to a runc bug, see https://github.com/opencontainers/runc/issues/1721#issuecomment-366315563
// once that is fixed, this can be cleaned up
stdoutFile := filepath.Join(logDir, serviceType+"."+name+".out.log")
stdout, err := os.OpenFile(stdoutFile, os.O_WRONLY|os.O_CREATE, 0644)
stdoutLog := serviceType + "." + name + ".out"
stdout, err := logger.Open(stdoutLog)
if err != nil {
log.Printf("Error opening stdout log file: %v", err)
log.Printf("Error opening stdout log connection: %v", err)
status = 1
continue
}
defer stdout.Close()
stderrFile := filepath.Join(logDir, serviceType+"."+name+".err.log")
stderr, err := os.OpenFile(stderrFile, os.O_WRONLY|os.O_CREATE, 0644)
stderrLog := serviceType + "." + name + ".err"
stderr, err := logger.Open(stderrLog)
if err != nil {
log.Printf("Error opening stderr log file: %v", err)
log.Printf("Error opening stderr log connection: %v", err)
status = 1
continue
}
@ -152,13 +150,11 @@ func runcInit(rootPath, serviceType string) int {
cleanup(path)
_ = os.Remove(pidfile)
// dump the log file outputs to os.Stdout/os.Stderr
if err = dumpFile(os.Stdout, stdoutFile); err != nil {
log.Printf("Error writing stdout of onboot service %s to console: %v", name, err)
}
if err = dumpFile(os.Stderr, stderrFile); err != nil {
log.Printf("Error writing stderr of onboot service %s to console: %v", name, err)
}
// ideally we want to use io.MultiWriter here, sending one stream to stdout/stderr, another to the log
// however, this hangs if we do, due to a runc bug, see https://github.com/opencontainers/runc/issues/1721#issuecomment-366315563
// once that is fixed, this can be cleaned up
logger.Dump(stdoutLog)
logger.Dump(stderrLog)
}
_ = os.RemoveAll(tmpdir)