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MINOR: debug: collect some boot-time info related to the process

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Here we collect the original uid/gid/rlimits for FD and RAM since these
ones do affect behavior and are sometimes different from expected in
containers or when starting as a service.
This commit is contained in:
Willy Tarreau 2023-11-22 15:37:57 +01:00
parent ff9e06cd53
commit c0eec3a4aa
1 changed files with 36 additions and 0 deletions
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36
src/debug.c
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@ -18,6 +18,7 @@
#include <stdio.h>
#include <stdlib.h>
#include <syslog.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/utsname.h>
@ -89,6 +90,15 @@ struct post_mortem {
char virt_techno[16]; // when provided by cpuid
char cont_techno[16]; // empty, "no", "yes", "docker" or others
} platform;
/* process-specific information */
struct {
pid_t pid;
uid_t boot_uid;
gid_t boot_gid;
struct rlimit limit_fd; // RLIMIT_NOFILE
struct rlimit limit_ram; // RLIMIT_AS or RLIMIT_DATA
} process;
} post_mortem ALIGNED(256) = { };
/* Points to a copy of the buffer where the dump functions should write, when
@ -486,6 +496,20 @@ static int debug_parse_cli_show_dev(char **args, char *payload, struct appctx *a
if (*post_mortem.platform.utsname.nodename)
chunk_appendf(&trash, " node name: %s\n", HA_ANON_CLI(post_mortem.platform.utsname.nodename));
chunk_appendf(&trash, "Process info\n");
chunk_appendf(&trash, " pid: %d\n", post_mortem.process.pid);
chunk_appendf(&trash, " boot uid: %d\n", post_mortem.process.boot_uid);
chunk_appendf(&trash, " boot gid: %d\n", post_mortem.process.boot_gid);
if ((ulong)post_mortem.process.limit_fd.rlim_cur != RLIM_INFINITY)
chunk_appendf(&trash, " fd limit (soft): %lu\n", (ulong)post_mortem.process.limit_fd.rlim_cur);
if ((ulong)post_mortem.process.limit_fd.rlim_max != RLIM_INFINITY)
chunk_appendf(&trash, " fd limit (hard): %lu\n", (ulong)post_mortem.process.limit_fd.rlim_max);
if ((ulong)post_mortem.process.limit_ram.rlim_cur != RLIM_INFINITY)
chunk_appendf(&trash, " ram limit (soft): %lu\n", (ulong)post_mortem.process.limit_ram.rlim_cur);
if ((ulong)post_mortem.process.limit_ram.rlim_max != RLIM_INFINITY)
chunk_appendf(&trash, " ram limit (hard): %lu\n", (ulong)post_mortem.process.limit_ram.rlim_max);
return cli_msg(appctx, LOG_INFO, trash.area);
}
@ -2101,6 +2125,18 @@ static int feed_post_mortem()
/* kernel type, version and arch */
uname(&post_mortem.platform.utsname);
/* some boot-time info related to the process */
post_mortem.process.pid = getpid();
post_mortem.process.boot_uid = geteuid();
post_mortem.process.boot_gid = getegid();
getrlimit(RLIMIT_NOFILE, &post_mortem.process.limit_fd);
#if defined(RLIMIT_AS)
getrlimit(RLIMIT_AS, &post_mortem.process.limit_ram);
#elif defined(RLIMIT_DATA)
getrlimit(RLIMIT_DATA, &post_mortem.process.limit_ram);
#endif
if (strcmp(post_mortem.platform.utsname.sysname, "Linux") == 0)
feed_post_mortem_linux();