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ceph/src/ceph_mon.cc
Loic Dachary ac15f1ad25 Merge pull request #1011 from dachary/wip-mon-daemonize 
do not daemonize ceph-mon when not necessary

Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
2013-12-31 17:12:39 -08:00

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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
*
* This is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software
* Foundation. See file COPYING.
*
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <iostream>
#include <string>
using namespace std;
#include "common/config.h"
#include "include/ceph_features.h"
#include "mon/MonMap.h"
#include "mon/Monitor.h"
#include "mon/MonitorDBStore.h"
#include "mon/MonClient.h"
#include "msg/Messenger.h"
#include "include/CompatSet.h"
#include "common/ceph_argparse.h"
#include "common/pick_address.h"
#include "common/Timer.h"
#include "common/errno.h"
#include "common/Preforker.h"
#include "global/global_init.h"
#include "global/signal_handler.h"
#include "include/assert.h"
#define dout_subsys ceph_subsys_mon
Monitor *mon = NULL;
void handle_mon_signal(int signum)
{
if (mon)
mon->handle_signal(signum);
}
int obtain_monmap(MonitorDBStore &store, bufferlist &bl)
{
dout(10) << __func__ << dendl;
/*
* the monmap may be in one of three places:
* 'monmap:<latest_version_no>' - the monmap we'd really like to have
* 'mon_sync:latest_monmap' - last monmap backed up for the last sync
* 'mkfs:monmap' - a monmap resulting from mkfs
*/
if (store.exists("monmap", "last_committed")) {
version_t latest_ver = store.get("monmap", "last_committed");
if (store.exists("monmap", latest_ver)) {
int err = store.get("monmap", latest_ver, bl);
assert(err == 0);
assert(bl.length() > 0);
dout(10) << __func__ << " read last committed monmap ver "
<< latest_ver << dendl;
return 0;
}
}
if (store.exists("mon_sync", "in_sync")
|| store.exists("mon_sync", "force_sync")) {
dout(10) << __func__ << " detected aborted sync" << dendl;
if (store.exists("mon_sync", "latest_monmap")) {
int err = store.get("mon_sync", "latest_monmap", bl);
assert(err == 0);
assert(bl.length() > 0);
dout(10) << __func__ << " read backup monmap" << dendl;
return 0;
}
}
if (store.exists("mkfs", "monmap")) {
dout(10) << __func__ << " found mkfs monmap" << dendl;
int err = store.get("mkfs", "monmap", bl);
assert(err == 0);
assert(bl.length() > 0);
return 0;
}
derr << __func__ << " unable to find a monmap" << dendl;
return -ENOENT;
}
int mon_data_exists(bool *r)
{
string mon_data = g_conf->mon_data;
struct stat buf;
if (::stat(mon_data.c_str(), &buf)) {
if (errno == ENOENT) {
*r = false;
} else {
cerr << "stat(" << mon_data << ") " << strerror(errno) << std::endl;
return -errno;
}
} else {
*r = true;
}
return 0;
}
int mon_data_empty(bool *r)
{
string mon_data = g_conf->mon_data;
DIR *dir = ::opendir(mon_data.c_str());
if (!dir) {
cerr << "opendir(" << mon_data << ") " << strerror(errno) << std::endl;
return -errno;
}
char buf[offsetof(struct dirent, d_name) + PATH_MAX + 1];
*r = false;
int code = 0;
struct dirent *de;
errno = 0;
while (!::readdir_r(dir, reinterpret_cast<struct dirent*>(buf), &de)) {
if (!de) {
if (errno) {
cerr << "readdir(" << mon_data << ") " << strerror(errno) << std::endl;
code = -errno;
}
break;
}
if (string(".") != de->d_name &&
string("..") != de->d_name) {
*r = true;
break;
}
}
::closedir(dir);
return code;
}
int mon_exists(bool *r)
{
int code = mon_data_exists(r);
if (code || *r == false)
return code;
return mon_data_empty(r);
}
void usage()
{
cerr << "usage: ceph-mon -i monid [flags]" << std::endl;
cerr << " --debug_mon n\n";
cerr << " debug monitor level (e.g. 10)\n";
cerr << " --mkfs\n";
cerr << " build fresh monitor fs\n";
cerr << " --force-sync\n";
cerr << " force a sync from another mon by wiping local data (BE CAREFUL)\n";
cerr << " --yes-i-really-mean-it\n";
cerr << " mandatory safeguard for --force-sync\n";
cerr << " --compact\n";
cerr << " compact the monitor store\n";
cerr << " --osdmap <filename>\n";
cerr << " only used when --mkfs is provided: load the osdmap from <filename>\n";
cerr << " --inject-monmap <filename>\n";
cerr << " write the <filename> monmap to the local monitor store and exit\n";
cerr << " --extract-monmap <filename>\n";
cerr << " extract the monmap from the local monitor store and exit\n";
cerr << " --mon-data <directory>\n";
cerr << " where the mon store and keyring are located\n";
generic_server_usage();
}
int main(int argc, const char **argv)
{
int err;
bool mkfs = false;
bool compact = false;
bool force_sync = false;
bool yes_really = false;
std::string osdmapfn, inject_monmap, extract_monmap;
vector<const char*> args;
argv_to_vec(argc, argv, args);
env_to_vec(args);
int flags = 0;
{
vector<const char*> args_copy = args;
std::string val;
for (std::vector<const char*>::iterator i = args_copy.begin();
i != args_copy.end(); ) {
if (ceph_argparse_double_dash(args_copy, i)) {
break;
} else if (ceph_argparse_flag(args_copy, i, "--mkfs", (char*)NULL)) {
flags |= CINIT_FLAG_NO_DAEMON_ACTIONS;
} else if (ceph_argparse_witharg(args_copy, i, &val, "--inject_monmap", (char*)NULL)) {
flags |= CINIT_FLAG_NO_DAEMON_ACTIONS;
} else if (ceph_argparse_witharg(args_copy, i, &val, "--extract-monmap", (char*)NULL)) {
flags |= CINIT_FLAG_NO_DAEMON_ACTIONS;
} else {
++i;
}
}
}
global_init(NULL, args, CEPH_ENTITY_TYPE_MON, CODE_ENVIRONMENT_DAEMON, flags);
uuid_d fsid;
std::string val;
for (std::vector<const char*>::iterator i = args.begin(); i != args.end(); ) {
if (ceph_argparse_double_dash(args, i)) {
break;
} else if (ceph_argparse_flag(args, i, "-h", "--help", (char*)NULL)) {
usage();
exit(0);
} else if (ceph_argparse_flag(args, i, "--mkfs", (char*)NULL)) {
mkfs = true;
} else if (ceph_argparse_flag(args, i, "--compact", (char*)NULL)) {
compact = true;
} else if (ceph_argparse_flag(args, i, "--force-sync", (char*)NULL)) {
force_sync = true;
} else if (ceph_argparse_flag(args, i, "--yes-i-really-mean-it", (char*)NULL)) {
yes_really = true;
} else if (ceph_argparse_witharg(args, i, &val, "--osdmap", (char*)NULL)) {
osdmapfn = val;
} else if (ceph_argparse_witharg(args, i, &val, "--inject_monmap", (char*)NULL)) {
inject_monmap = val;
} else if (ceph_argparse_witharg(args, i, &val, "--extract-monmap", (char*)NULL)) {
extract_monmap = val;
} else {
++i;
}
}
if (!args.empty()) {
cerr << "too many arguments: " << args << std::endl;
usage();
}
if (force_sync && !yes_really) {
cerr << "are you SURE you want to force a sync? this will erase local data and may\n"
<< "break your mon cluster. pass --yes-i-really-mean-it if you do." << std::endl;
exit(1);
}
if (g_conf->mon_data.empty()) {
cerr << "must specify '--mon-data=foo' data path" << std::endl;
usage();
}
if (g_conf->name.get_id().empty()) {
cerr << "must specify id (--id <id> or --name mon.<id>)" << std::endl;
usage();
}
bool exists;
if (mon_exists(&exists))
exit(1);
if (mkfs && exists) {
cerr << g_conf->mon_data << " already exists" << std::endl;
exit(0);
}
// -- mkfs --
if (mkfs) {
if (mon_data_exists(&exists))
exit(1);
if (!exists) {
if (::mkdir(g_conf->mon_data.c_str(), 0755)) {
cerr << "mkdir(" << g_conf->mon_data << ") : "
<< strerror(errno) << std::endl;
exit(1);
}
}
// resolve public_network -> public_addr
pick_addresses(g_ceph_context, CEPH_PICK_ADDRESS_PUBLIC);
common_init_finish(g_ceph_context, flags);
bufferlist monmapbl, osdmapbl;
std::string error;
MonMap monmap;
// load or generate monmap
if (g_conf->monmap.length()) {
int err = monmapbl.read_file(g_conf->monmap.c_str(), &error);
if (err < 0) {
cerr << argv[0] << ": error reading " << g_conf->monmap << ": " << error << std::endl;
exit(1);
}
try {
monmap.decode(monmapbl);
// always mark seed/mkfs monmap as epoch 0
monmap.set_epoch(0);
}
catch (const buffer::error& e) {
cerr << argv[0] << ": error decoding monmap " << g_conf->monmap << ": " << e.what() << std::endl;
exit(1);
}
} else {
int err = monmap.build_initial(g_ceph_context, cerr);
if (err < 0) {
cerr << argv[0] << ": warning: no initial monitors; must use admin socket to feed hints" << std::endl;
}
// am i part of the initial quorum?
if (monmap.contains(g_conf->name.get_id())) {
// hmm, make sure the ip listed exists on the current host?
// maybe later.
} else if (!g_conf->public_addr.is_blank_ip()) {
entity_addr_t a = g_conf->public_addr;
if (a.get_port() == 0)
a.set_port(CEPH_MON_PORT);
if (monmap.contains(a)) {
string name;
monmap.get_addr_name(a, name);
monmap.rename(name, g_conf->name.get_id());
cout << argv[0] << ": renaming mon." << name << " " << a
<< " to mon." << g_conf->name.get_id() << std::endl;
}
} else {
// is a local address listed without a name? if so, name myself.
list<entity_addr_t> ls;
monmap.list_addrs(ls);
entity_addr_t local;
if (have_local_addr(g_ceph_context, ls, &local)) {
string name;
monmap.get_addr_name(local, name);
if (name.find("noname-") == 0) {
cout << argv[0] << ": mon." << name << " " << local
<< " is local, renaming to mon." << g_conf->name.get_id() << std::endl;
monmap.rename(name, g_conf->name.get_id());
} else {
cout << argv[0] << ": mon." << name << " " << local
<< " is local, but not 'noname-' + something; not assuming it's me" << std::endl;
}
}
}
}
if (!g_conf->fsid.is_zero()) {
monmap.fsid = g_conf->fsid;
cout << argv[0] << ": set fsid to " << g_conf->fsid << std::endl;
}
if (monmap.fsid.is_zero()) {
cerr << argv[0] << ": generated monmap has no fsid; use '--fsid <uuid>'" << std::endl;
exit(10);
}
//monmap.print(cout);
// osdmap
if (osdmapfn.length()) {
err = osdmapbl.read_file(osdmapfn.c_str(), &error);
if (err < 0) {
cerr << argv[0] << ": error reading " << osdmapfn << ": "
<< error << std::endl;
exit(1);
}
}
// go
MonitorDBStore store(g_conf->mon_data);
int r = store.create_and_open(cerr);
if (r < 0) {
cerr << argv[0] << ": error opening mon data directory at '"
<< g_conf->mon_data << "': " << cpp_strerror(r) << std::endl;
exit(1);
}
assert(r == 0);
Monitor mon(g_ceph_context, g_conf->name.get_id(), &store, 0, &monmap);
r = mon.mkfs(osdmapbl);
if (r < 0) {
cerr << argv[0] << ": error creating monfs: " << cpp_strerror(r) << std::endl;
exit(1);
}
cout << argv[0] << ": created monfs at " << g_conf->mon_data
<< " for " << g_conf->name << std::endl;
return 0;
}
// we fork early to prevent leveldb's environment static state from
// screwing us over
Preforker prefork;
if (!(flags & CINIT_FLAG_NO_DAEMON_ACTIONS)) {
if (g_conf->daemonize) {
global_init_prefork(g_ceph_context, 0);
prefork.prefork();
if (prefork.is_parent()) {
return prefork.parent_wait();
}
global_init_postfork(g_ceph_context, 0);
}
common_init_finish(g_ceph_context);
global_init_chdir(g_ceph_context);
}
MonitorDBStore *store = new MonitorDBStore(g_conf->mon_data);
Monitor::StoreConverter converter(g_conf->mon_data, store);
if (store->open(std::cerr) < 0) {
int ret = store->create_and_open(std::cerr);
if (ret < 0) {
derr << "failed to create new leveldb store" << dendl;
prefork.exit(1);
}
ret = converter.needs_conversion();
if (ret < 0) {
derr << "found errors while validating legacy unconverted monitor store: "
<< cpp_strerror(ret) << dendl;
prefork.exit(1);
}
if (ret > 0) {
cout << "converting monitor store, please do not interrupt..." << std::endl;
int r = converter.convert();
if (r) {
derr << "failed to convert monitor store: " << cpp_strerror(r) << dendl;
prefork.exit(1);
}
}
} else if (converter.is_converting()) {
derr << "there is an on-going (maybe aborted?) conversion." << dendl;
derr << "you should check what happened" << dendl;
derr << "remove store.db to restart conversion" << dendl;
prefork.exit(1);
}
bufferlist magicbl;
err = store->get(Monitor::MONITOR_NAME, "magic", magicbl);
if (!magicbl.length()) {
cerr << "unable to read magic from mon data.. did you run mkcephfs?" << std::endl;
prefork.exit(1);
}
string magic(magicbl.c_str(), magicbl.length()-1); // ignore trailing \n
if (strcmp(magic.c_str(), CEPH_MON_ONDISK_MAGIC)) {
cerr << "mon fs magic '" << magic << "' != current '" << CEPH_MON_ONDISK_MAGIC << "'" << std::endl;
prefork.exit(1);
}
err = Monitor::check_features(store);
if (err < 0) {
cerr << "error checking features: " << cpp_strerror(err) << std::endl;
prefork.exit(1);
}
// inject new monmap?
if (!inject_monmap.empty()) {
bufferlist bl;
std::string error;
int r = bl.read_file(inject_monmap.c_str(), &error);
if (r) {
cerr << "unable to read monmap from " << inject_monmap << ": "
<< error << std::endl;
prefork.exit(1);
}
// get next version
version_t v = store->get("monmap", "last_committed");
cout << "last committed monmap epoch is " << v << ", injected map will be " << (v+1) << std::endl;
v++;
// set the version
MonMap tmp;
tmp.decode(bl);
if (tmp.get_epoch() != v) {
cout << "changing monmap epoch from " << tmp.get_epoch() << " to " << v << std::endl;
tmp.set_epoch(v);
}
bufferlist mapbl;
tmp.encode(mapbl, CEPH_FEATURES_ALL);
bufferlist final;
::encode(v, final);
::encode(mapbl, final);
MonitorDBStore::Transaction t;
// save it
t.put("monmap", v, mapbl);
t.put("monmap", "latest", final);
t.put("monmap", "last_committed", v);
store->apply_transaction(t);
cout << "done." << std::endl;
prefork.exit(0);
}
// monmap?
MonMap monmap;
{
// note that even if we don't find a viable monmap, we should go ahead
// and try to build it up in the next if-else block.
bufferlist mapbl;
int err = obtain_monmap(*store, mapbl);
if (err >= 0) {
try {
monmap.decode(mapbl);
} catch (const buffer::error& e) {
cerr << "can't decode monmap: " << e.what() << std::endl;
}
} else {
derr << "unable to obtain a monmap: " << cpp_strerror(err) << dendl;
}
if (!extract_monmap.empty()) {
int r = mapbl.write_file(extract_monmap.c_str());
if (r < 0) {
r = -errno;
derr << "error writing monmap to " << extract_monmap << ": " << cpp_strerror(r) << dendl;
prefork.exit(1);
}
derr << "wrote monmap to " << extract_monmap << dendl;
prefork.exit(0);
}
}
// this is what i will bind to
entity_addr_t ipaddr;
if (monmap.contains(g_conf->name.get_id())) {
ipaddr = monmap.get_addr(g_conf->name.get_id());
// print helpful warning if the conf file doesn't match
entity_addr_t conf_addr;
std::vector <std::string> my_sections;
g_conf->get_my_sections(my_sections);
std::string mon_addr_str;
if (g_conf->get_val_from_conf_file(my_sections, "mon addr",
mon_addr_str, true) == 0) {
if (conf_addr.parse(mon_addr_str.c_str()) && (ipaddr != conf_addr)) {
cerr << "WARNING: 'mon addr' config option " << conf_addr
<< " does not match monmap file" << std::endl
<< " continuing with monmap configuration" << std::endl;
}
}
} else {
dout(0) << g_conf->name << " does not exist in monmap, will attempt to join an existing cluster" << dendl;
pick_addresses(g_ceph_context, CEPH_PICK_ADDRESS_PUBLIC);
if (!g_conf->public_addr.is_blank_ip()) {
ipaddr = g_conf->public_addr;
if (ipaddr.get_port() == 0)
ipaddr.set_port(CEPH_MON_PORT);
dout(0) << "using public_addr " << g_conf->public_addr << " -> "
<< ipaddr << dendl;
} else {
MonMap tmpmap;
int err = tmpmap.build_initial(g_ceph_context, cerr);
if (err < 0) {
cerr << argv[0] << ": error generating initial monmap: " << cpp_strerror(err) << std::endl;
usage();
prefork.exit(1);
}
if (tmpmap.contains(g_conf->name.get_id())) {
ipaddr = tmpmap.get_addr(g_conf->name.get_id());
} else {
derr << "no public_addr or public_network specified, and " << g_conf->name
<< " not present in monmap or ceph.conf" << dendl;
prefork.exit(1);
}
}
}
// bind
int rank = monmap.get_rank(g_conf->name.get_id());
Messenger *messenger = Messenger::create(g_ceph_context,
entity_name_t::MON(rank),
"mon",
0);
messenger->set_cluster_protocol(CEPH_MON_PROTOCOL);
messenger->set_default_send_priority(CEPH_MSG_PRIO_HIGH);
uint64_t supported =
CEPH_FEATURE_UID |
CEPH_FEATURE_NOSRCADDR |
CEPH_FEATURE_MONCLOCKCHECK |
CEPH_FEATURE_PGID64 |
CEPH_FEATURE_MSG_AUTH;
messenger->set_default_policy(Messenger::Policy::stateless_server(supported, 0));
messenger->set_policy(entity_name_t::TYPE_MON,
Messenger::Policy::lossless_peer_reuse(supported,
CEPH_FEATURE_UID |
CEPH_FEATURE_PGID64 |
CEPH_FEATURE_MON_SINGLE_PAXOS));
messenger->set_policy(entity_name_t::TYPE_OSD,
Messenger::Policy::stateless_server(supported,
CEPH_FEATURE_PGID64 |
CEPH_FEATURE_OSDENC));
messenger->set_policy(entity_name_t::TYPE_CLIENT,
Messenger::Policy::stateless_server(supported, 0));
messenger->set_policy(entity_name_t::TYPE_MDS,
Messenger::Policy::stateless_server(supported, 0));
// throttle client traffic
Throttle *client_throttler = new Throttle(g_ceph_context, "mon_client_bytes",
g_conf->mon_client_bytes);
messenger->set_policy_throttlers(entity_name_t::TYPE_CLIENT, client_throttler, NULL);
// throttle daemon traffic
// NOTE: actual usage on the leader may multiply by the number of
// monitors if they forward large update messages from daemons.
Throttle *daemon_throttler = new Throttle(g_ceph_context, "mon_daemon_bytes",
g_conf->mon_daemon_bytes);
messenger->set_policy_throttlers(entity_name_t::TYPE_OSD, daemon_throttler, NULL);
messenger->set_policy_throttlers(entity_name_t::TYPE_MDS, daemon_throttler, NULL);
cout << "starting " << g_conf->name << " rank " << rank
<< " at " << ipaddr
<< " mon_data " << g_conf->mon_data
<< " fsid " << monmap.get_fsid()
<< std::endl;
err = messenger->bind(ipaddr);
if (err < 0)
prefork.exit(1);
// start monitor
mon = new Monitor(g_ceph_context, g_conf->name.get_id(), store,
messenger, &monmap);
if (force_sync) {
derr << "flagging a forced sync ..." << dendl;
mon->sync_force(NULL, cerr);
}
err = mon->preinit();
if (err < 0)
prefork.exit(1);
if (compact || g_conf->mon_compact_on_start) {
derr << "compacting monitor store ..." << dendl;
mon->store->compact();
derr << "done compacting" << dendl;
}
if (g_conf->daemonize)
prefork.daemonize();
messenger->start();
mon->init();
// set up signal handlers, now that we've daemonized/forked.
init_async_signal_handler();
register_async_signal_handler(SIGHUP, sighup_handler);
register_async_signal_handler_oneshot(SIGINT, handle_mon_signal);
register_async_signal_handler_oneshot(SIGTERM, handle_mon_signal);
if (g_conf->inject_early_sigterm)
kill(getpid(), SIGTERM);
messenger->wait();
unregister_async_signal_handler(SIGHUP, sighup_handler);
unregister_async_signal_handler(SIGINT, handle_mon_signal);
unregister_async_signal_handler(SIGTERM, handle_mon_signal);
shutdown_async_signal_handler();
delete mon;
delete store;
delete messenger;
delete client_throttler;
delete daemon_throttler;
g_ceph_context->put();
// cd on exit, so that gmon.out (if any) goes into a separate directory for each node.
char s[20];
snprintf(s, sizeof(s), "gmon/%d", getpid());
if ((mkdir(s, 0755) == 0) && (chdir(s) == 0)) {
dout(0) << "ceph-mon: gmon.out should be in " << s << dendl;
}
prefork.signal_exit(0);
return 0;
}
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