void createServerInstanceDirAndGeneration(ServerInstanceDirPtr &serverInstanceDir,
ServerInstanceDir::GenerationPtr &generation)
{
serverInstanceDir.reset(new ServerInstanceDir(getpid()));
generation = serverInstanceDir->newGeneration(geteuid() == 0,
"nobody", getPrimaryGroupName("nobody"),
geteuid(), getegid());
}
int
main(int argc, char *argv[]) {
disableOomKiller();
agentsOptions = initializeAgent(argc, argv, "PassengerWatchdog");
logLevel = agentsOptions.getInt("log_level");
webServerPid = agentsOptions.getPid("web_server_pid");
tempDir = agentsOptions.get("temp_dir");
userSwitching = agentsOptions.getBool("user_switching");
defaultUser = agentsOptions.get("default_user");
defaultGroup = agentsOptions.get("default_group");
webServerWorkerUid = agentsOptions.getUid("web_server_worker_uid");
webServerWorkerGid = agentsOptions.getGid("web_server_worker_gid");
passengerRoot = agentsOptions.get("passenger_root");
rubyCommand = agentsOptions.get("ruby");
maxPoolSize = agentsOptions.getInt("max_pool_size");
maxInstancesPerApp = agentsOptions.getInt("max_instances_per_app");
poolIdleTime = agentsOptions.getInt("pool_idle_time");
serializedPrestartURLs = agentsOptions.get("prestart_urls");
try {
randomGenerator = new RandomGenerator();
errorEvent = new EventFd();
MessageChannel feedbackChannel(FEEDBACK_FD);
serverInstanceDir.reset(new ServerInstanceDir(webServerPid, tempDir));
generation = serverInstanceDir->newGeneration(userSwitching, defaultUser,
defaultGroup, webServerWorkerUid, webServerWorkerGid);
agentsOptions.set("server_instance_dir", serverInstanceDir->getPath());
agentsOptions.setInt("generation_number", generation->getNumber());
ServerInstanceDirToucher serverInstanceDirToucher;
ResourceLocator resourceLocator(passengerRoot);
if (agentsOptions.get("analytics_server", false).empty()) {
// Using local, server instance specific logging agent.
loggingAgentAddress = "unix:" + generation->getPath() + "/logging.socket";
loggingAgentPassword = randomGenerator->generateAsciiString(64);
} else {
// Using remote logging agent.
loggingAgentAddress = agentsOptions.get("analytics_server");
}
HelperAgentWatcher helperAgentWatcher(resourceLocator);
LoggingAgentWatcher loggingAgentWatcher(resourceLocator);
vector<AgentWatcher *> watchers;
vector<AgentWatcher *>::iterator it;
watchers.push_back(&helperAgentWatcher);
if (agentsOptions.get("analytics_server", false).empty()) {
watchers.push_back(&loggingAgentWatcher);
}
for (it = watchers.begin(); it != watchers.end(); it++) {
try {
(*it)->start();
} catch (const std::exception &e) {
feedbackChannel.write("Watchdog startup error",
e.what(), NULL);
forceAllAgentsShutdown(watchers);
return 1;
}
// Allow other exceptions to propagate and crash the watchdog.
}
for (it = watchers.begin(); it != watchers.end(); it++) {
try {
(*it)->startWatching();
} catch (const std::exception &e) {
feedbackChannel.write("Watchdog startup error",
e.what(), NULL);
forceAllAgentsShutdown(watchers);
return 1;
}
// Allow other exceptions to propagate and crash the watchdog.
}
feedbackChannel.write("Basic startup info",
serverInstanceDir->getPath().c_str(),
toString(generation->getNumber()).c_str(),
NULL);
for (it = watchers.begin(); it != watchers.end(); it++) {
(*it)->sendStartupInfo(feedbackChannel);
}
feedbackChannel.write("All agents started", NULL);
this_thread::disable_interruption di;
this_thread::disable_syscall_interruption dsi;
bool exitGracefully = waitForStarterProcessOrWatchers(watchers);
AgentWatcher::stopWatching(watchers);
if (exitGracefully) {
/* Fork a child process which cleans up all the agent processes in
* the background and exit this watchdog process so that we don't block
* the web server.
*/
cleanupAgentsInBackground(watchers);
return 0;
} else {
P_DEBUG("Web server did not exit gracefully, forcing shutdown of all service processes...");
forceAllAgentsShutdown(watchers);
return 1;
}
} catch (const tracable_exception &e) {
P_ERROR(e.what() << "\n" << e.backtrace());
return 1;
} catch (const std::exception &e) {
P_ERROR(e.what());
return 1;
}
}
int
main(int argc, char *argv[]) {
/*
* Some Apache installations (like on OS X) redirect stdout to /dev/null,
* so that only stderr is redirected to the log file. We therefore
* forcefully redirect stdout to stderr so that everything ends up in the
* same place.
*/
dup2(2, 1);
/*
* Most operating systems overcommit memory. We *know* that this watchdog process
* doesn't use much memory; on OS X it uses about 200 KB of private RSS. If the
* watchdog is killed by the system Out-Of-Memory Killer or then it's all over:
* the system administrator will have to restart the web server for Phusion
* Passenger to be usable again. So here we disable Linux's OOM killer
* for this watchdog. Note that the OOM score is inherited by child processes
* so we need to restore it after each fork().
*/
oldOomScore = setOomScoreNeverKill();
agentsOptions = initializeAgent(argc, argv, "PassengerWatchdog");
agentsOptions
.setDefaultInt ("log_level", DEFAULT_LOG_LEVEL)
.setDefault ("temp_dir", getSystemTempDir())
.setDefaultBool("user_switching", true)
.setDefault ("default_user", DEFAULT_WEB_APP_USER)
.setDefaultUid ("web_server_worker_uid", getuid())
.setDefaultGid ("web_server_worker_gid", getgid())
.setDefault ("ruby", DEFAULT_RUBY)
.setDefault ("python", DEFAULT_PYTHON)
.setDefaultInt ("max_pool_size", DEFAULT_MAX_POOL_SIZE)
.setDefaultInt ("max_instances_per_app", DEFAULT_MAX_INSTANCES_PER_APP)
.setDefaultInt ("pool_idle_time", DEFAULT_POOL_IDLE_TIME);
P_DEBUG("Starting Watchdog...");
try {
TRACE_POINT();
// Required options
passengerRoot = agentsOptions.get("passenger_root");
webServerPid = agentsOptions.getPid("web_server_pid");
// Optional options
UPDATE_TRACE_POINT();
tempDir = agentsOptions.get("temp_dir");
userSwitching = agentsOptions.getBool("user_switching");
defaultUser = agentsOptions.get("default_user");
if (!agentsOptions.has("default_group")) {
agentsOptions.set("default_group", inferDefaultGroup(defaultUser));
}
defaultGroup = agentsOptions.get("default_group");
webServerWorkerUid = agentsOptions.getUid("web_server_worker_uid");
webServerWorkerGid = agentsOptions.getGid("web_server_worker_gid");
UPDATE_TRACE_POINT();
randomGenerator = new RandomGenerator();
errorEvent = new EventFd();
UPDATE_TRACE_POINT();
serverInstanceDir.reset(new ServerInstanceDir(webServerPid, tempDir));
generation = serverInstanceDir->newGeneration(userSwitching, defaultUser,
defaultGroup, webServerWorkerUid, webServerWorkerGid);
agentsOptions.set("server_instance_dir", serverInstanceDir->getPath());
agentsOptions.setInt("generation_number", generation->getNumber());
UPDATE_TRACE_POINT();
ServerInstanceDirToucher serverInstanceDirToucher;
ResourceLocator resourceLocator(passengerRoot);
if (agentsOptions.get("analytics_server", false).empty()) {
// Using local, server instance specific logging agent.
loggingAgentAddress = "unix:" + generation->getPath() + "/logging.socket";
loggingAgentPassword = randomGenerator->generateAsciiString(64);
} else {
// Using remote logging agent.
loggingAgentAddress = agentsOptions.get("analytics_server");
}
UPDATE_TRACE_POINT();
shared_ptr<HelperAgentWatcher> helperAgentWatcher =
make_shared<HelperAgentWatcher>(resourceLocator);
shared_ptr<LoggingAgentWatcher> loggingAgentWatcher =
make_shared<LoggingAgentWatcher>(resourceLocator);
UPDATE_TRACE_POINT();
vector<AgentWatcherPtr> watchers;
vector<AgentWatcherPtr>::iterator it;
watchers.push_back(helperAgentWatcher);
if (agentsOptions.get("analytics_server", false).empty()) {
watchers.push_back(loggingAgentWatcher);
}
UPDATE_TRACE_POINT();
for (it = watchers.begin(); it != watchers.end(); it++) {
try {
(*it)->start();
} catch (const std::exception &e) {
writeArrayMessage(FEEDBACK_FD,
"Watchdog startup error",
e.what(),
NULL);
forceAllAgentsShutdown(watchers);
return 1;
}
// Allow other exceptions to propagate and crash the watchdog.
}
UPDATE_TRACE_POINT();
for (it = watchers.begin(); it != watchers.end(); it++) {
try {
(*it)->startWatching();
} catch (const std::exception &e) {
writeArrayMessage(FEEDBACK_FD,
"Watchdog startup error",
e.what(),
NULL);
forceAllAgentsShutdown(watchers);
return 1;
}
// Allow other exceptions to propagate and crash the watchdog.
}
UPDATE_TRACE_POINT();
writeArrayMessage(FEEDBACK_FD,
"Basic startup info",
serverInstanceDir->getPath().c_str(),
toString(generation->getNumber()).c_str(),
NULL);
UPDATE_TRACE_POINT();
for (it = watchers.begin(); it != watchers.end(); it++) {
(*it)->sendStartupInfo(FEEDBACK_FD);
}
UPDATE_TRACE_POINT();
writeArrayMessage(FEEDBACK_FD, "All agents started", NULL);
P_DEBUG("All Phusion Passenger agents started!");
this_thread::disable_interruption di;
this_thread::disable_syscall_interruption dsi;
UPDATE_TRACE_POINT();
bool exitGracefully = waitForStarterProcessOrWatchers(watchers);
if (exitGracefully) {
/* Fork a child process which cleans up all the agent processes in
* the background and exit this watchdog process so that we don't block
* the web server.
*/
P_DEBUG("Web server exited gracefully; gracefully shutting down all agents...");
} else {
P_DEBUG("Web server did not exit gracefully, forcing shutdown of all agents...");
}
UPDATE_TRACE_POINT();
AgentWatcher::stopWatching(watchers);
if (exitGracefully) {
UPDATE_TRACE_POINT();
cleanupAgentsInBackground(watchers);
return 0;
} else {
UPDATE_TRACE_POINT();
forceAllAgentsShutdown(watchers);
return 1;
}
} catch (const tracable_exception &e) {
P_ERROR(e.what() << "\n" << e.backtrace());
return 1;
} catch (const std::exception &e) {
P_ERROR(e.what());
return 1;
}
}