> -----Original Message-----
> From: Masayoshi Mizuma [mailto:[email protected]]
> Sent: Wednesday, August 8, 2018 4:30 AM
> To: Qi, Fuli/斉 福利 <[email protected]>; [email protected]
> Subject: Re: [ndctl PATCH 2/4] ndctl, monitor: set default log destination to
> syslog
> if "--daemon" is specified
>
> Hi Qi,
>
> On 08/07/2018 09:17 AM, QI Fuli wrote:
> > When running monitor as a daemon, if the log destination is "standard"
> > or a relative path for log file, the messages will not be able to be logged.
> > Sometimes, users may not notice that the default log destination is
> > "standard"
> > when they start monitor daemon by systemctl, so they will lose messages.
> > This patch is used to fix the unfriendly interface. When running
> > monitor as a daemon, the default log destination will be changed to
> > syslog. Also, the messages will be forwarded to syslog if the log
> > destination is
> a relative path for log file.
> >
> > Signed-off-by: QI Fuli <[email protected]>
> > ---
> > Documentation/ndctl/ndctl-monitor.txt | 16 +++++++++++++++-
> > ndctl/monitor.c | 5 ++++-
> > ndctl/monitor.conf | 2 ++
> > 3 files changed, 21 insertions(+), 2 deletions(-)
> >
> > diff --git a/Documentation/ndctl/ndctl-monitor.txt
> > b/Documentation/ndctl/ndctl-monitor.txt
> > index 1cba9ea..9a8d76b 100644
> > --- a/Documentation/ndctl/ndctl-monitor.txt
> > +++ b/Documentation/ndctl/ndctl-monitor.txt
> > @@ -67,7 +67,21 @@ OPTIONS
> >
> > -l <file | syslog | standard>::
> > --log=<file | syslog | standard>::
> > - Output notifications to <file>, syslog or standard output.
> > + Send log messages to the specified destination.
> > ++
> > +--
> > +<file>::
> > + Send log messages to specified <file>. When fopen() is not able
> > + to open <file>, log messages will be forwarded to syslog.
> > +syslog::
> > + Send messages to syslog.
> > +standard::
> > + Send messages to standard output.
> > +--
> > ++
> > +The default log destination is 'syslog' if "--daemon" is specified,
> > +otherwise 'standard'. Note that standard and relative path for <file>
> > +will not work if "--daemon" is specified.
> >
> > -c::
> > --config-file=::
> > diff --git a/ndctl/monitor.c b/ndctl/monitor.c index bf1f1d3..2f3d751
> > 100644
> > --- a/ndctl/monitor.c
> > +++ b/ndctl/monitor.c
> > @@ -93,7 +93,8 @@ static void log_file(struct ndctl_ctx *ctx, int priority,
> > const
> char *file,
> > f = fopen(monitor.log, "a+");
> > if (!f) {
> > ndctl_set_log_fn(ctx, log_syslog);
> > - err(ctx, "open logfile %s failed\n", monitor.log);
> > + err(ctx, "open logfile %s failed, forward messages to syslog\n",
> > + monitor.log);
> > did_fail = 1;
> > notice(ctx, "%s\n", buf);
> > goto end;
> > @@ -644,6 +645,8 @@ int cmd_monitor(int argc, const char **argv, void *ctx)
> > }
> >
> > if (monitor.daemon) {
>
> Why don't you add './standard' check? Like as:
>
> if (strncmp(monitor.log, "./standard", 10) == 0)
> error("daemon doesn't work for 'standard' log
> option");
> goto out;
>
Hi Masa,
Thank you for your comment.
When running monitor as a daemon, the messages will not be able to be logged in
following cases.
a) Users set the log destination to standard by using [--log] option or setting
value of "log" in config file.
b) The log destination is standard by default.
c) Users set the log destination to a relative path of log file by using
[--log] option or setting value of "log" in config file.
The './standard' check will only works for case a).
Also, it would be more friendly to set a default log destination to monitor
daemon.
Thanks,
QI
> Thanks,
> Masa
>
> > + if (!monitor.log || strncmp(monitor.log, "./", 2) == 0)
> > + ndctl_set_log_fn((struct ndctl_ctx *)ctx, log_syslog);
>
> > if (daemon(0, 0) != 0) {
> > err((struct ndctl_ctx *)ctx, "daemon start failed\n");
> > goto out;
> > diff --git a/ndctl/monitor.conf b/ndctl/monitor.conf index
> > 857aadf..934e2c0 100644
> > --- a/ndctl/monitor.conf
> > +++ b/ndctl/monitor.conf
> > @@ -38,4 +38,6 @@
> > # to standard output (log=standard) or to write into a special file
> > (log=<file>) # by setting key "log". If this value is in conflict
> > with the value of # [--log=<value>] option, this value will be ignored.
> > +# Note: Setting value to "standard" or relative path for <file> will
> > +not work # when running moniotr as a daemon.
> > # log = /var/log/ndctl/monitor.log
> >
>
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