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1 | // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- |
2 | // vim: ts=8 sw=2 smarttab | |
3 | /* | |
4 | * Ceph - scalable distributed file system | |
5 | * | |
6 | * Copyright (C) 2016 John Spray <john.spray@redhat.com> | |
7 | * | |
8 | * This is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU Lesser General Public | |
10 | * License version 2.1, as published by the Free Software | |
11 | * Foundation. See file COPYING. | |
12 | */ | |
13 | ||
14 | #include <Python.h> | |
15 | ||
16 | #include "common/errno.h" | |
31f18b77 FG |
17 | #include "common/signal.h" |
18 | #include "include/compat.h" | |
7c673cae FG |
19 | |
20 | #include "include/stringify.h" | |
21 | #include "global/global_context.h" | |
22 | #include "global/signal_handler.h" | |
23 | ||
24 | #include "mgr/MgrContext.h" | |
25 | ||
26 | #include "messages/MMgrBeacon.h" | |
27 | #include "messages/MMgrMap.h" | |
28 | #include "Mgr.h" | |
29 | ||
30 | #include "MgrStandby.h" | |
31 | ||
32 | #define dout_context g_ceph_context | |
33 | #define dout_subsys ceph_subsys_mgr | |
34 | #undef dout_prefix | |
35 | #define dout_prefix *_dout << "mgr " << __func__ << " " | |
36 | ||
37 | ||
31f18b77 | 38 | MgrStandby::MgrStandby(int argc, const char **argv) : |
7c673cae FG |
39 | Dispatcher(g_ceph_context), |
40 | monc{g_ceph_context}, | |
41 | client_messenger(Messenger::create_client_messenger(g_ceph_context, "mgr")), | |
42 | objecter{g_ceph_context, client_messenger.get(), &monc, NULL, 0, 0}, | |
43 | client{client_messenger.get(), &monc, &objecter}, | |
44 | log_client(g_ceph_context, client_messenger.get(), &monc.monmap, LogClient::NO_FLAGS), | |
45 | clog(log_client.create_channel(CLOG_CHANNEL_CLUSTER)), | |
46 | audit_clog(log_client.create_channel(CLOG_CHANNEL_AUDIT)), | |
47 | lock("MgrStandby::lock"), | |
48 | timer(g_ceph_context, lock), | |
31f18b77 FG |
49 | active_mgr(nullptr), |
50 | orig_argc(argc), | |
51 | orig_argv(argv) | |
7c673cae FG |
52 | { |
53 | } | |
54 | ||
55 | MgrStandby::~MgrStandby() = default; | |
56 | ||
57 | const char** MgrStandby::get_tracked_conf_keys() const | |
58 | { | |
59 | static const char* KEYS[] = { | |
60 | // clog & admin clog | |
61 | "clog_to_monitors", | |
62 | "clog_to_syslog", | |
63 | "clog_to_syslog_facility", | |
64 | "clog_to_syslog_level", | |
65 | "osd_objectstore_fuse", | |
66 | "clog_to_graylog", | |
67 | "clog_to_graylog_host", | |
68 | "clog_to_graylog_port", | |
69 | "host", | |
70 | "fsid", | |
71 | NULL | |
72 | }; | |
73 | return KEYS; | |
74 | } | |
75 | ||
76 | void MgrStandby::handle_conf_change( | |
77 | const struct md_config_t *conf, | |
78 | const std::set <std::string> &changed) | |
79 | { | |
80 | if (changed.count("clog_to_monitors") || | |
81 | changed.count("clog_to_syslog") || | |
82 | changed.count("clog_to_syslog_level") || | |
83 | changed.count("clog_to_syslog_facility") || | |
84 | changed.count("clog_to_graylog") || | |
85 | changed.count("clog_to_graylog_host") || | |
86 | changed.count("clog_to_graylog_port") || | |
87 | changed.count("host") || | |
88 | changed.count("fsid")) { | |
89 | _update_log_config(); | |
90 | } | |
91 | } | |
92 | ||
93 | int MgrStandby::init() | |
94 | { | |
95 | Mutex::Locker l(lock); | |
96 | ||
97 | // Initialize Messenger | |
98 | client_messenger->add_dispatcher_tail(this); | |
99 | client_messenger->add_dispatcher_head(&objecter); | |
100 | client_messenger->add_dispatcher_tail(&client); | |
101 | client_messenger->start(); | |
102 | ||
103 | // Initialize MonClient | |
104 | if (monc.build_initial_monmap() < 0) { | |
105 | client_messenger->shutdown(); | |
106 | client_messenger->wait(); | |
107 | return -1; | |
108 | } | |
109 | ||
110 | monc.sub_want("mgrmap", 0, 0); | |
111 | ||
112 | monc.set_want_keys(CEPH_ENTITY_TYPE_MON|CEPH_ENTITY_TYPE_OSD | |
113 | |CEPH_ENTITY_TYPE_MDS|CEPH_ENTITY_TYPE_MGR); | |
114 | monc.set_messenger(client_messenger.get()); | |
115 | int r = monc.init(); | |
116 | if (r < 0) { | |
117 | monc.shutdown(); | |
118 | client_messenger->shutdown(); | |
119 | client_messenger->wait(); | |
120 | return r; | |
121 | } | |
122 | r = monc.authenticate(); | |
123 | if (r < 0) { | |
124 | derr << "Authentication failed, did you specify a mgr ID with a valid keyring?" << dendl; | |
125 | monc.shutdown(); | |
126 | client_messenger->shutdown(); | |
127 | client_messenger->wait(); | |
128 | return r; | |
129 | } | |
130 | ||
131 | client_t whoami = monc.get_global_id(); | |
132 | client_messenger->set_myname(entity_name_t::CLIENT(whoami.v)); | |
133 | monc.set_log_client(&log_client); | |
134 | _update_log_config(); | |
135 | objecter.set_client_incarnation(0); | |
136 | objecter.init(); | |
137 | objecter.start(); | |
138 | client.init(); | |
139 | timer.init(); | |
140 | ||
31f18b77 | 141 | tick(); |
7c673cae FG |
142 | |
143 | dout(4) << "Complete." << dendl; | |
144 | return 0; | |
145 | } | |
146 | ||
147 | void MgrStandby::send_beacon() | |
148 | { | |
149 | assert(lock.is_locked_by_me()); | |
150 | dout(1) << state_str() << dendl; | |
7c673cae | 151 | |
224ce89b WB |
152 | set<string> modules; |
153 | PyModules::list_modules(&modules); | |
7c673cae FG |
154 | bool available = active_mgr != nullptr && active_mgr->is_initialized(); |
155 | auto addr = available ? active_mgr->get_server_addr() : entity_addr_t(); | |
224ce89b WB |
156 | dout(10) << "sending beacon as gid " << monc.get_global_id() |
157 | << " modules " << modules << dendl; | |
158 | ||
7c673cae FG |
159 | MMgrBeacon *m = new MMgrBeacon(monc.get_fsid(), |
160 | monc.get_global_id(), | |
161 | g_conf->name.get_id(), | |
162 | addr, | |
224ce89b WB |
163 | available, |
164 | modules); | |
7c673cae | 165 | monc.send_mon_message(m); |
31f18b77 FG |
166 | } |
167 | ||
168 | void MgrStandby::tick() | |
169 | { | |
224ce89b | 170 | dout(10) << __func__ << dendl; |
31f18b77 FG |
171 | send_beacon(); |
172 | ||
173 | if (active_mgr) { | |
174 | active_mgr->tick(); | |
175 | } | |
176 | ||
177 | timer.add_event_after(g_conf->mgr_tick_period, new FunctionContext( | |
7c673cae | 178 | [this](int r){ |
31f18b77 | 179 | tick(); |
7c673cae FG |
180 | } |
181 | )); | |
182 | } | |
183 | ||
184 | void MgrStandby::handle_signal(int signum) | |
185 | { | |
186 | Mutex::Locker l(lock); | |
187 | assert(signum == SIGINT || signum == SIGTERM); | |
188 | derr << "*** Got signal " << sig_str(signum) << " ***" << dendl; | |
189 | shutdown(); | |
190 | } | |
191 | ||
192 | void MgrStandby::shutdown() | |
193 | { | |
194 | // Expect already to be locked as we're called from signal handler | |
195 | assert(lock.is_locked_by_me()); | |
196 | ||
197 | // stop sending beacon first, i use monc to talk with monitors | |
198 | timer.shutdown(); | |
199 | // client uses monc and objecter | |
200 | client.shutdown(); | |
201 | // stop monc, so mon won't be able to instruct me to shutdown/activate after | |
202 | // the active_mgr is stopped | |
203 | monc.shutdown(); | |
204 | if (active_mgr) { | |
205 | active_mgr->shutdown(); | |
206 | } | |
207 | // objecter is used by monc and active_mgr | |
208 | objecter.shutdown(); | |
209 | // client_messenger is used by all of them, so stop it in the end | |
210 | client_messenger->shutdown(); | |
211 | } | |
212 | ||
31f18b77 FG |
213 | void MgrStandby::respawn() |
214 | { | |
215 | char *new_argv[orig_argc+1]; | |
216 | dout(1) << " e: '" << orig_argv[0] << "'" << dendl; | |
217 | for (int i=0; i<orig_argc; i++) { | |
218 | new_argv[i] = (char *)orig_argv[i]; | |
219 | dout(1) << " " << i << ": '" << orig_argv[i] << "'" << dendl; | |
220 | } | |
221 | new_argv[orig_argc] = NULL; | |
222 | ||
223 | /* Determine the path to our executable, test if Linux /proc/self/exe exists. | |
224 | * This allows us to exec the same executable even if it has since been | |
225 | * unlinked. | |
226 | */ | |
227 | char exe_path[PATH_MAX] = ""; | |
228 | if (readlink(PROCPREFIX "/proc/self/exe", exe_path, PATH_MAX-1) == -1) { | |
229 | /* Print CWD for the user's interest */ | |
230 | char buf[PATH_MAX]; | |
231 | char *cwd = getcwd(buf, sizeof(buf)); | |
232 | assert(cwd); | |
233 | dout(1) << " cwd " << cwd << dendl; | |
234 | ||
235 | /* Fall back to a best-effort: just running in our CWD */ | |
236 | strncpy(exe_path, orig_argv[0], PATH_MAX-1); | |
237 | } else { | |
238 | dout(1) << "respawning with exe " << exe_path << dendl; | |
239 | strcpy(exe_path, PROCPREFIX "/proc/self/exe"); | |
240 | } | |
241 | ||
242 | dout(1) << " exe_path " << exe_path << dendl; | |
243 | ||
244 | unblock_all_signals(NULL); | |
245 | execv(exe_path, new_argv); | |
246 | ||
247 | derr << "respawn execv " << orig_argv[0] | |
248 | << " failed with " << cpp_strerror(errno) << dendl; | |
249 | ceph_abort(); | |
250 | } | |
251 | ||
7c673cae FG |
252 | void MgrStandby::_update_log_config() |
253 | { | |
254 | map<string,string> log_to_monitors; | |
255 | map<string,string> log_to_syslog; | |
256 | map<string,string> log_channel; | |
257 | map<string,string> log_prio; | |
258 | map<string,string> log_to_graylog; | |
259 | map<string,string> log_to_graylog_host; | |
260 | map<string,string> log_to_graylog_port; | |
261 | uuid_d fsid; | |
262 | string host; | |
263 | ||
264 | if (parse_log_client_options(cct, log_to_monitors, log_to_syslog, | |
265 | log_channel, log_prio, log_to_graylog, | |
266 | log_to_graylog_host, log_to_graylog_port, | |
267 | fsid, host) == 0) { | |
268 | clog->update_config(log_to_monitors, log_to_syslog, | |
269 | log_channel, log_prio, log_to_graylog, | |
270 | log_to_graylog_host, log_to_graylog_port, | |
271 | fsid, host); | |
272 | audit_clog->update_config(log_to_monitors, log_to_syslog, | |
273 | log_channel, log_prio, log_to_graylog, | |
274 | log_to_graylog_host, log_to_graylog_port, | |
275 | fsid, host); | |
276 | } | |
277 | } | |
278 | ||
279 | void MgrStandby::handle_mgr_map(MMgrMap* mmap) | |
280 | { | |
281 | auto map = mmap->get_map(); | |
282 | dout(4) << "received map epoch " << map.get_epoch() << dendl; | |
283 | const bool active_in_map = map.active_gid == monc.get_global_id(); | |
284 | dout(4) << "active in map: " << active_in_map | |
285 | << " active is " << map.active_gid << dendl; | |
286 | if (active_in_map) { | |
287 | if (!active_mgr) { | |
288 | dout(1) << "Activating!" << dendl; | |
224ce89b | 289 | active_mgr.reset(new Mgr(&monc, map, client_messenger.get(), &objecter, |
7c673cae | 290 | &client, clog, audit_clog)); |
224ce89b WB |
291 | active_mgr->background_init(new FunctionContext( |
292 | [this](int r){ | |
293 | // Advertise our active-ness ASAP instead of waiting for | |
294 | // next tick. | |
295 | Mutex::Locker l(lock); | |
296 | send_beacon(); | |
297 | })); | |
298 | dout(1) << "I am now activating" << dendl; | |
7c673cae FG |
299 | } else { |
300 | dout(10) << "I was already active" << dendl; | |
224ce89b WB |
301 | bool need_respawn = active_mgr->got_mgr_map(map); |
302 | if (need_respawn) { | |
303 | respawn(); | |
304 | } | |
7c673cae FG |
305 | } |
306 | } else { | |
307 | if (active_mgr != nullptr) { | |
308 | derr << "I was active but no longer am" << dendl; | |
31f18b77 | 309 | respawn(); |
7c673cae FG |
310 | } |
311 | } | |
312 | ||
313 | mmap->put(); | |
314 | } | |
315 | ||
316 | bool MgrStandby::ms_dispatch(Message *m) | |
317 | { | |
318 | Mutex::Locker l(lock); | |
319 | dout(4) << state_str() << " " << *m << dendl; | |
320 | ||
31f18b77 FG |
321 | if (m->get_type() == MSG_MGR_MAP) { |
322 | handle_mgr_map(static_cast<MMgrMap*>(m)); | |
323 | return true; | |
324 | } else if (active_mgr) { | |
325 | auto am = active_mgr; | |
326 | lock.Unlock(); | |
327 | bool handled = am->ms_dispatch(m); | |
328 | lock.Lock(); | |
329 | return handled; | |
330 | } else { | |
331 | return false; | |
7c673cae | 332 | } |
7c673cae FG |
333 | } |
334 | ||
335 | ||
336 | bool MgrStandby::ms_get_authorizer(int dest_type, AuthAuthorizer **authorizer, | |
337 | bool force_new) | |
338 | { | |
339 | if (dest_type == CEPH_ENTITY_TYPE_MON) | |
340 | return true; | |
341 | ||
342 | if (force_new) { | |
343 | if (monc.wait_auth_rotating(10) < 0) | |
344 | return false; | |
345 | } | |
346 | ||
347 | *authorizer = monc.build_authorizer(dest_type); | |
348 | return *authorizer != NULL; | |
349 | } | |
350 | ||
351 | bool MgrStandby::ms_handle_refused(Connection *con) | |
352 | { | |
353 | // do nothing for now | |
354 | return false; | |
355 | } | |
356 | ||
357 | // A reference for use by the signal handler | |
358 | static MgrStandby *signal_mgr = nullptr; | |
359 | ||
360 | static void handle_mgr_signal(int signum) | |
361 | { | |
362 | if (signal_mgr) { | |
363 | signal_mgr->handle_signal(signum); | |
364 | } | |
365 | } | |
366 | ||
367 | int MgrStandby::main(vector<const char *> args) | |
368 | { | |
369 | // Enable signal handlers | |
370 | signal_mgr = this; | |
371 | init_async_signal_handler(); | |
372 | register_async_signal_handler(SIGHUP, sighup_handler); | |
373 | register_async_signal_handler_oneshot(SIGINT, handle_mgr_signal); | |
374 | register_async_signal_handler_oneshot(SIGTERM, handle_mgr_signal); | |
375 | ||
376 | client_messenger->wait(); | |
377 | ||
378 | // Disable signal handlers | |
379 | unregister_async_signal_handler(SIGHUP, sighup_handler); | |
380 | unregister_async_signal_handler(SIGINT, handle_mgr_signal); | |
381 | unregister_async_signal_handler(SIGTERM, handle_mgr_signal); | |
382 | shutdown_async_signal_handler(); | |
383 | signal_mgr = nullptr; | |
384 | ||
385 | return 0; | |
386 | } | |
387 | ||
388 | ||
389 | std::string MgrStandby::state_str() | |
390 | { | |
391 | return active_mgr == nullptr ? "standby" : "active"; | |
392 | } | |
393 |