X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=src%2Fceph%2Fsrc%2Fmon%2FLogMonitor.cc;fp=src%2Fceph%2Fsrc%2Fmon%2FLogMonitor.cc;h=b52767f9bceb8563dda0a866a16c568e8b623653;hb=812ff6ca9fcd3e629e49d4328905f33eee8ca3f5;hp=0000000000000000000000000000000000000000;hpb=15280273faafb77777eab341909a3f495cf248d9;p=stor4nfv.git

diff --git a/src/ceph/src/mon/LogMonitor.cc b/src/ceph/src/mon/LogMonitor.cc
new file mode 100644
index 0000000..b52767f
--- /dev/null
+++ b/src/ceph/src/mon/LogMonitor.cc
@@ -0,0 +1,845 @@
+// -*- 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 <boost/algorithm/string/predicate.hpp>
+
+#include <sstream>
+#include <syslog.h>
+
+#include "LogMonitor.h"
+#include "Monitor.h"
+#include "MonitorDBStore.h"
+
+#include "messages/MMonCommand.h"
+#include "messages/MLog.h"
+#include "messages/MLogAck.h"
+#include "common/Graylog.h"
+#include "common/errno.h"
+#include "common/strtol.h"
+#include "include/assert.h"
+#include "include/str_list.h"
+#include "include/str_map.h"
+#include "include/compat.h"
+
+#define dout_subsys ceph_subsys_mon
+#undef dout_prefix
+#define dout_prefix _prefix(_dout, mon, get_last_committed())
+static ostream& _prefix(std::ostream *_dout, Monitor *mon, version_t v) {
+  return *_dout << "mon." << mon->name << "@" << mon->rank
+		<< "(" << mon->get_state_name()
+		<< ").log v" << v << " ";
+}
+
+ostream& operator<<(ostream &out, const LogMonitor &pm)
+{
+  return out << "log";
+}
+
+/*
+ Tick function to update the map based on performance every N seconds
+*/
+
+void LogMonitor::tick() 
+{
+  if (!is_active()) return;
+
+  dout(10) << *this << dendl;
+
+}
+
+void LogMonitor::create_initial()
+{
+  dout(10) << "create_initial -- creating initial map" << dendl;
+  LogEntry e;
+  memset(&e.who, 0, sizeof(e.who));
+  e.name = g_conf->name;
+  e.stamp = ceph_clock_now();
+  e.prio = CLOG_INFO;
+  std::stringstream ss;
+  ss << "mkfs " << mon->monmap->get_fsid();
+  e.msg = ss.str();
+  e.seq = 0;
+  pending_log.insert(pair<utime_t,LogEntry>(e.stamp, e));
+}
+
+void LogMonitor::update_from_paxos(bool *need_bootstrap)
+{
+  dout(10) << __func__ << dendl;
+  version_t version = get_last_committed();
+  dout(10) << __func__ << " version " << version
+           << " summary v " << summary.version << dendl;
+  if (version == summary.version)
+    return;
+  assert(version >= summary.version);
+
+  map<string,bufferlist> channel_blog;
+
+  version_t latest_full = get_version_latest_full();
+  dout(10) << __func__ << " latest full " << latest_full << dendl;
+  if ((latest_full > 0) && (latest_full > summary.version)) {
+    bufferlist latest_bl;
+    get_version_full(latest_full, latest_bl);
+    assert(latest_bl.length() != 0);
+    dout(7) << __func__ << " loading summary e" << latest_full << dendl;
+    bufferlist::iterator p = latest_bl.begin();
+    ::decode(summary, p);
+    dout(7) << __func__ << " loaded summary e" << summary.version << dendl;
+  }
+
+  // walk through incrementals
+  while (version > summary.version) {
+    bufferlist bl;
+    int err = get_version(summary.version+1, bl);
+    assert(err == 0);
+    assert(bl.length());
+
+    bufferlist::iterator p = bl.begin();
+    __u8 v;
+    ::decode(v, p);
+    while (!p.end()) {
+      LogEntry le;
+      le.decode(p);
+      dout(7) << "update_from_paxos applying incremental log " << summary.version+1 <<  " " << le << dendl;
+
+      string channel = le.channel;
+      if (channel.empty()) // keep retrocompatibility
+        channel = CLOG_CHANNEL_CLUSTER;
+
+      if (channels.do_log_to_syslog(channel)) {
+        string level = channels.get_level(channel);
+        string facility = channels.get_facility(channel);
+        if (level.empty() || facility.empty()) {
+          derr << __func__ << " unable to log to syslog -- level or facility"
+               << " not defined (level: " << level << ", facility: "
+               << facility << ")" << dendl;
+          continue;
+        }
+        le.log_to_syslog(channels.get_level(channel),
+                         channels.get_facility(channel));
+      }
+
+      if (channels.do_log_to_graylog(channel)) {
+	ceph::logging::Graylog::Ref graylog = channels.get_graylog(channel);
+	if (graylog) {
+	  graylog->log_log_entry(&le);
+	}
+	dout(7) << "graylog: " << channel << " " << graylog
+		<< " host:" << channels.log_to_graylog_host << dendl;
+      }
+
+      string log_file = channels.get_log_file(channel);
+      dout(20) << __func__ << " logging for channel '" << channel
+               << "' to file '" << log_file << "'" << dendl;
+
+      if (!log_file.empty()) {
+        string log_file_level = channels.get_log_file_level(channel);
+        if (log_file_level.empty()) {
+          dout(1) << __func__ << " warning: log file level not defined for"
+                  << " channel '" << channel << "' yet a log file is --"
+                  << " will assume lowest level possible" << dendl;
+        }
+
+	int min = string_to_syslog_level(log_file_level);
+	int l = clog_type_to_syslog_level(le.prio);
+	if (l <= min) {
+	  stringstream ss;
+	  ss << le << "\n";
+          // init entry if DNE
+          bufferlist &blog = channel_blog[channel];
+          blog.append(ss.str());
+	}
+      }
+
+      summary.add(le);
+    }
+
+    summary.version++;
+    summary.prune(g_conf->mon_log_max_summary);
+  }
+
+  dout(15) << __func__ << " logging for "
+           << channel_blog.size() << " channels" << dendl;
+  for(map<string,bufferlist>::iterator p = channel_blog.begin();
+      p != channel_blog.end(); ++p) {
+    if (!p->second.length()) {
+      dout(15) << __func__ << " channel '" << p->first
+               << "': nothing to log" << dendl;
+      continue;
+    }
+
+    dout(15) << __func__ << " channel '" << p->first
+             << "' logging " << p->second.length() << " bytes" << dendl;
+    string log_file = channels.get_log_file(p->first);
+
+    int fd = ::open(log_file.c_str(), O_WRONLY|O_APPEND|O_CREAT, 0600);
+    if (fd < 0) {
+      int err = -errno;
+      dout(1) << "unable to write to '" << log_file << "' for channel '"
+              << p->first << "': " << cpp_strerror(err) << dendl;
+    } else {
+      int err = p->second.write_fd(fd);
+      if (err < 0) {
+	dout(1) << "error writing to '" << log_file << "' for channel '"
+                << p->first << ": " << cpp_strerror(err) << dendl;
+      }
+      VOID_TEMP_FAILURE_RETRY(::close(fd));
+    }
+  }
+
+  check_subs();
+}
+
+void LogMonitor::create_pending()
+{
+  pending_log.clear();
+  pending_summary = summary;
+  dout(10) << "create_pending v " << (get_last_committed() + 1) << dendl;
+}
+
+void LogMonitor::encode_pending(MonitorDBStore::TransactionRef t)
+{
+  version_t version = get_last_committed() + 1;
+  bufferlist bl;
+  dout(10) << __func__ << " v" << version << dendl;
+  __u8 v = 1;
+  ::encode(v, bl);
+  multimap<utime_t,LogEntry>::iterator p;
+  for (p = pending_log.begin(); p != pending_log.end(); ++p)
+    p->second.encode(bl, mon->get_quorum_con_features());
+
+  put_version(t, version, bl);
+  put_last_committed(t, version);
+}
+
+void LogMonitor::encode_full(MonitorDBStore::TransactionRef t)
+{
+  dout(10) << __func__ << " log v " << summary.version << dendl;
+  assert(get_last_committed() == summary.version);
+
+  bufferlist summary_bl;
+  ::encode(summary, summary_bl, mon->get_quorum_con_features());
+
+  put_version_full(t, summary.version, summary_bl);
+  put_version_latest_full(t, summary.version);
+}
+
+version_t LogMonitor::get_trim_to()
+{
+  if (!mon->is_leader())
+    return 0;
+
+  unsigned max = g_conf->mon_max_log_epochs;
+  version_t version = get_last_committed();
+  if (version > max)
+    return version - max;
+  return 0;
+}
+
+bool LogMonitor::preprocess_query(MonOpRequestRef op)
+{
+  op->mark_logmon_event("preprocess_query");
+  PaxosServiceMessage *m = static_cast<PaxosServiceMessage*>(op->get_req());
+  dout(10) << "preprocess_query " << *m << " from " << m->get_orig_source_inst() << dendl;
+  switch (m->get_type()) {
+  case MSG_MON_COMMAND:
+    return preprocess_command(op);
+
+  case MSG_LOG:
+    return preprocess_log(op);
+
+  default:
+    ceph_abort();
+    return true;
+  }
+}
+
+bool LogMonitor::prepare_update(MonOpRequestRef op)
+{
+  op->mark_logmon_event("prepare_update");
+  PaxosServiceMessage *m = static_cast<PaxosServiceMessage*>(op->get_req());
+  dout(10) << "prepare_update " << *m << " from " << m->get_orig_source_inst() << dendl;
+  switch (m->get_type()) {
+  case MSG_MON_COMMAND:
+    return prepare_command(op);
+  case MSG_LOG:
+    return prepare_log(op);
+  default:
+    ceph_abort();
+    return false;
+  }
+}
+
+bool LogMonitor::preprocess_log(MonOpRequestRef op)
+{
+  op->mark_logmon_event("preprocess_log");
+  MLog *m = static_cast<MLog*>(op->get_req());
+  dout(10) << "preprocess_log " << *m << " from " << m->get_orig_source() << dendl;
+  int num_new = 0;
+
+  MonSession *session = m->get_session();
+  if (!session)
+    goto done;
+  if (!session->is_capable("log", MON_CAP_W)) {
+    dout(0) << "preprocess_log got MLog from entity with insufficient privileges "
+	    << session->caps << dendl;
+    goto done;
+  }
+  
+  for (deque<LogEntry>::iterator p = m->entries.begin();
+       p != m->entries.end();
+       ++p) {
+    if (!pending_summary.contains(p->key()))
+      num_new++;
+  }
+  if (!num_new) {
+    dout(10) << "  nothing new" << dendl;
+    goto done;
+  }
+
+  return false;
+
+ done:
+  return true;
+}
+
+struct LogMonitor::C_Log : public C_MonOp {
+  LogMonitor *logmon;
+  C_Log(LogMonitor *p, MonOpRequestRef o) :
+    C_MonOp(o), logmon(p) {}
+  void _finish(int r) override {
+    if (r == -ECANCELED) {
+      return;
+    }
+    logmon->_updated_log(op);
+  }
+};
+
+bool LogMonitor::prepare_log(MonOpRequestRef op) 
+{
+  op->mark_logmon_event("prepare_log");
+  MLog *m = static_cast<MLog*>(op->get_req());
+  dout(10) << "prepare_log " << *m << " from " << m->get_orig_source() << dendl;
+
+  if (m->fsid != mon->monmap->fsid) {
+    dout(0) << "handle_log on fsid " << m->fsid << " != " << mon->monmap->fsid 
+	    << dendl;
+    return false;
+  }
+
+  for (deque<LogEntry>::iterator p = m->entries.begin();
+       p != m->entries.end();
+       ++p) {
+    dout(10) << " logging " << *p << dendl;
+    if (!pending_summary.contains(p->key())) {
+      pending_summary.add(*p);
+      pending_log.insert(pair<utime_t,LogEntry>(p->stamp, *p));
+    }
+  }
+  pending_summary.prune(g_conf->mon_log_max_summary);
+  wait_for_finished_proposal(op, new C_Log(this, op));
+  return true;
+}
+
+void LogMonitor::_updated_log(MonOpRequestRef op)
+{
+  MLog *m = static_cast<MLog*>(op->get_req());
+  dout(7) << "_updated_log for " << m->get_orig_source_inst() << dendl;
+  mon->send_reply(op, new MLogAck(m->fsid, m->entries.rbegin()->seq));
+}
+
+bool LogMonitor::should_propose(double& delay)
+{
+  // commit now if we have a lot of pending events
+  if (g_conf->mon_max_log_entries_per_event > 0 &&
+      pending_log.size() >= (unsigned)g_conf->mon_max_log_entries_per_event)
+    return true;
+
+  // otherwise fall back to generic policy
+  return PaxosService::should_propose(delay);
+}
+
+
+bool LogMonitor::preprocess_command(MonOpRequestRef op)
+{
+  op->mark_logmon_event("preprocess_command");
+  MMonCommand *m = static_cast<MMonCommand*>(op->get_req());
+  int r = -EINVAL;
+  bufferlist rdata;
+  stringstream ss;
+
+  map<string, cmd_vartype> cmdmap;
+  if (!cmdmap_from_json(m->cmd, &cmdmap, ss)) {
+    string rs = ss.str();
+    mon->reply_command(op, -EINVAL, rs, get_last_committed());
+    return true;
+  }
+  MonSession *session = m->get_session();
+  if (!session) {
+    mon->reply_command(op, -EACCES, "access denied", get_last_committed());
+    return true;
+  }
+
+  string prefix;
+  cmd_getval(g_ceph_context, cmdmap, "prefix", prefix);
+
+  string format;
+  cmd_getval(g_ceph_context, cmdmap, "format", format, string("plain"));
+  boost::scoped_ptr<Formatter> f(Formatter::create(format));
+
+  if (prefix == "log last") {
+    int64_t num = 20;
+    cmd_getval(g_ceph_context, cmdmap, "num", num);
+    if (f) {
+      f->open_array_section("tail");
+    }
+
+    std::string level_str;
+    clog_type level;
+    if (cmd_getval(g_ceph_context, cmdmap, "level", level_str)) {
+      level = LogEntry::str_to_level(level_str);
+      if (level == CLOG_UNKNOWN) {
+        ss << "Invalid severity '" << level_str << "'";
+        mon->reply_command(op, -EINVAL, ss.str(), get_last_committed());
+        return true;
+      }
+    } else {
+      level = CLOG_INFO;
+    }
+
+    std::string channel;
+    if (!cmd_getval(g_ceph_context, cmdmap, "channel", channel)) {
+      channel = CLOG_CHANNEL_DEFAULT;
+    }
+
+    // We'll apply this twice, once while counting out lines
+    // and once while outputting them.
+    auto match = [level, channel](const LogEntry &entry) {
+      return entry.prio >= level && (entry.channel == channel || channel == "*");
+    };
+
+    auto rp = summary.tail.rbegin();
+    for (; num > 0 && rp != summary.tail.rend(); ++rp) {
+      if (match(*rp)) {
+        num--;
+      }
+    }
+    if (rp == summary.tail.rend()) {
+      --rp;
+    }
+    ostringstream ss;
+    for (; rp != summary.tail.rbegin(); --rp) {
+      if (!match(*rp)) {
+        continue;
+      }
+
+      if (f) {
+	f->dump_object("entry", *rp);
+      } else {
+	ss << *rp << "\n";
+      }
+    }
+    if (f) {
+      f->close_section();
+      f->flush(rdata);
+    } else {
+      rdata.append(ss.str());
+    }
+    r = 0;
+  } else {
+    return false;
+  }
+
+  string rs;
+  getline(ss, rs);
+  mon->reply_command(op, r, rs, rdata, get_last_committed());
+  return true;
+}
+
+
+bool LogMonitor::prepare_command(MonOpRequestRef op)
+{
+  op->mark_logmon_event("prepare_command");
+  MMonCommand *m = static_cast<MMonCommand*>(op->get_req());
+  stringstream ss;
+  string rs;
+  int err = -EINVAL;
+
+  map<string, cmd_vartype> cmdmap;
+  if (!cmdmap_from_json(m->cmd, &cmdmap, ss)) {
+    // ss has reason for failure
+    string rs = ss.str();
+    mon->reply_command(op, -EINVAL, rs, get_last_committed());
+    return true;
+  }
+
+  string prefix;
+  cmd_getval(g_ceph_context, cmdmap, "prefix", prefix);
+
+  MonSession *session = m->get_session();
+  if (!session) {
+    mon->reply_command(op, -EACCES, "access denied", get_last_committed());
+    return true;
+  }
+
+  if (prefix == "log") {
+    vector<string> logtext;
+    cmd_getval(g_ceph_context, cmdmap, "logtext", logtext);
+    LogEntry le;
+    le.who = m->get_orig_source_inst();
+    le.name = session->entity_name;
+    le.stamp = m->get_recv_stamp();
+    le.seq = 0;
+    le.prio = CLOG_INFO;
+    le.channel = CLOG_CHANNEL_DEFAULT;
+    le.msg = str_join(logtext, " ");
+    pending_summary.add(le);
+    pending_summary.prune(g_conf->mon_log_max_summary);
+    pending_log.insert(pair<utime_t,LogEntry>(le.stamp, le));
+    wait_for_finished_proposal(op, new Monitor::C_Command(
+          mon, op, 0, string(), get_last_committed() + 1));
+    return true;
+  }
+
+  getline(ss, rs);
+  mon->reply_command(op, err, rs, get_last_committed());
+  return false;
+}
+
+
+int LogMonitor::sub_name_to_id(const string& n)
+{
+  if (n.substr(0, 4) == "log-" && n.size() > 4) {
+    return LogEntry::str_to_level(n.substr(4));
+  } else {
+    return CLOG_UNKNOWN;
+  }
+}
+
+void LogMonitor::check_subs()
+{
+  dout(10) << __func__ << dendl;
+  for (map<string, xlist<Subscription*>*>::iterator i = mon->session_map.subs.begin();
+       i != mon->session_map.subs.end();
+       ++i) {
+    for (xlist<Subscription*>::iterator j = i->second->begin(); !j.end(); ++j) {
+      if (sub_name_to_id((*j)->type) >= 0)
+	check_sub(*j);
+    }
+  }
+}
+
+void LogMonitor::check_sub(Subscription *s)
+{
+  dout(10) << __func__ << " client wants " << s->type << " ver " << s->next << dendl;
+
+  int sub_level = sub_name_to_id(s->type);
+  assert(sub_level >= 0);
+
+  version_t summary_version = summary.version;
+  if (s->next > summary_version) {
+    dout(10) << __func__ << " client " << s->session->inst 
+	    << " requested version (" << s->next << ") is greater than ours (" 
+	    << summary_version << "), which means we already sent him" 
+	    << " everything we have." << dendl;
+    return;
+  } 
+ 
+  MLog *mlog = new MLog(mon->monmap->fsid);
+
+  if (s->next == 0) { 
+    /* First timer, heh? */
+    bool ret = _create_sub_summary(mlog, sub_level);
+    if (!ret) {
+      dout(1) << __func__ << " ret = " << ret << dendl;
+      mlog->put();
+      return;
+    }
+  } else {
+    /* let us send you an incremental log... */
+    _create_sub_incremental(mlog, sub_level, s->next);
+  }
+
+  dout(1) << __func__ << " sending message to " << s->session->inst 
+	  << " with " << mlog->entries.size() << " entries"
+	  << " (version " << mlog->version << ")" << dendl;
+  
+  if (!mlog->entries.empty()) {
+    s->session->con->send_message(mlog);
+  } else {
+    mlog->put();
+  }
+  if (s->onetime)
+    mon->session_map.remove_sub(s);
+  else
+    s->next = summary_version+1;
+}
+
+/**
+ * Create a log message containing only the last message in the summary.
+ *
+ * @param mlog	Log message we'll send to the client.
+ * @param level Maximum log level the client is interested in.
+ * @return	'true' if we consider we successfully populated @mlog;
+ *		'false' otherwise.
+ */
+bool LogMonitor::_create_sub_summary(MLog *mlog, int level)
+{
+  dout(10) << __func__ << dendl;
+
+  assert(mlog != NULL);
+
+  if (!summary.tail.size())
+    return false;
+
+  list<LogEntry>::reverse_iterator it = summary.tail.rbegin();
+  for (; it != summary.tail.rend(); ++it) {
+    LogEntry e = *it;
+    if (e.prio < level)
+      continue;
+
+    mlog->entries.push_back(e);
+    mlog->version = summary.version;
+    break;
+  }
+
+  return true;
+}
+
+/**
+ * Create an incremental log message from version \p sv to \p summary.version
+ *
+ * @param mlog	Log message we'll send to the client with the messages received
+ *		since version \p sv, inclusive.
+ * @param level	The max log level of the messages the client is interested in.
+ * @param sv	The version the client is looking for.
+ */
+void LogMonitor::_create_sub_incremental(MLog *mlog, int level, version_t sv)
+{
+  dout(10) << __func__ << " level " << level << " ver " << sv 
+	  << " cur summary ver " << summary.version << dendl; 
+
+  if (sv < get_first_committed()) {
+    dout(10) << __func__ << " skipped from " << sv
+	     << " to first_committed " << get_first_committed() << dendl;
+    LogEntry le;
+    le.stamp = ceph_clock_now();
+    le.prio = CLOG_WARN;
+    ostringstream ss;
+    ss << "skipped log messages from " << sv << " to " << get_first_committed();
+    le.msg = ss.str();
+    mlog->entries.push_back(le);
+    sv = get_first_committed();
+  }
+
+  version_t summary_ver = summary.version;
+  while (sv <= summary_ver) {
+    bufferlist bl;
+    int err = get_version(sv, bl);
+    assert(err == 0);
+    assert(bl.length());
+    bufferlist::iterator p = bl.begin();
+    __u8 v;
+    ::decode(v,p);
+    while (!p.end()) {
+      LogEntry le;
+      le.decode(p);
+
+      if (le.prio < level) {
+	dout(20) << __func__ << " requested " << level 
+		 << " entry " << le.prio << dendl;
+	continue;
+      }
+
+      mlog->entries.push_back(le);
+    }
+    mlog->version = sv++;
+  }
+
+  dout(10) << __func__ << " incremental message ready (" 
+	   << mlog->entries.size() << " entries)" << dendl;
+}
+
+void LogMonitor::update_log_channels()
+{
+  ostringstream oss;
+
+  channels.clear();
+
+  int r = get_conf_str_map_helper(g_conf->mon_cluster_log_to_syslog,
+                                  oss, &channels.log_to_syslog,
+                                  CLOG_CONFIG_DEFAULT_KEY);
+  if (r < 0) {
+    derr << __func__ << " error parsing 'mon_cluster_log_to_syslog'" << dendl;
+    return;
+  }
+
+  r = get_conf_str_map_helper(g_conf->mon_cluster_log_to_syslog_level,
+                              oss, &channels.syslog_level,
+                              CLOG_CONFIG_DEFAULT_KEY);
+  if (r < 0) {
+    derr << __func__ << " error parsing 'mon_cluster_log_to_syslog_level'"
+         << dendl;
+    return;
+  }
+
+  r = get_conf_str_map_helper(g_conf->mon_cluster_log_to_syslog_facility,
+                              oss, &channels.syslog_facility,
+                              CLOG_CONFIG_DEFAULT_KEY);
+  if (r < 0) {
+    derr << __func__ << " error parsing 'mon_cluster_log_to_syslog_facility'"
+         << dendl;
+    return;
+  }
+
+  r = get_conf_str_map_helper(g_conf->mon_cluster_log_file, oss,
+                              &channels.log_file,
+                              CLOG_CONFIG_DEFAULT_KEY);
+  if (r < 0) {
+    derr << __func__ << " error parsing 'mon_cluster_log_file'" << dendl;
+    return;
+  }
+
+  r = get_conf_str_map_helper(g_conf->mon_cluster_log_file_level, oss,
+                              &channels.log_file_level,
+                              CLOG_CONFIG_DEFAULT_KEY);
+  if (r < 0) {
+    derr << __func__ << " error parsing 'mon_cluster_log_file_level'"
+         << dendl;
+    return;
+  }
+
+  r = get_conf_str_map_helper(g_conf->mon_cluster_log_to_graylog, oss,
+                              &channels.log_to_graylog,
+                              CLOG_CONFIG_DEFAULT_KEY);
+  if (r < 0) {
+    derr << __func__ << " error parsing 'mon_cluster_log_to_graylog'"
+         << dendl;
+    return;
+  }
+
+  r = get_conf_str_map_helper(g_conf->mon_cluster_log_to_graylog_host, oss,
+                              &channels.log_to_graylog_host,
+                              CLOG_CONFIG_DEFAULT_KEY);
+  if (r < 0) {
+    derr << __func__ << " error parsing 'mon_cluster_log_to_graylog_host'"
+         << dendl;
+    return;
+  }
+
+  r = get_conf_str_map_helper(g_conf->mon_cluster_log_to_graylog_port, oss,
+                              &channels.log_to_graylog_port,
+                              CLOG_CONFIG_DEFAULT_KEY);
+  if (r < 0) {
+    derr << __func__ << " error parsing 'mon_cluster_log_to_graylog_port'"
+         << dendl;
+    return;
+  }
+
+  channels.expand_channel_meta();
+}
+
+void LogMonitor::log_channel_info::expand_channel_meta(map<string,string> &m)
+{
+  generic_dout(20) << __func__ << " expand map: " << m << dendl;
+  for (map<string,string>::iterator p = m.begin(); p != m.end(); ++p) {
+    m[p->first] = expand_channel_meta(p->second, p->first);
+  }
+  generic_dout(20) << __func__ << " expanded map: " << m << dendl;
+}
+
+string LogMonitor::log_channel_info::expand_channel_meta(
+    const string &input,
+    const string &change_to)
+{
+  size_t pos = string::npos;
+  string s(input);
+  while ((pos = s.find(LOG_META_CHANNEL)) != string::npos) {
+    string tmp = s.substr(0, pos) + change_to;
+    if (pos+LOG_META_CHANNEL.length() < s.length())
+      tmp += s.substr(pos+LOG_META_CHANNEL.length());
+    s = tmp;
+  }
+  generic_dout(20) << __func__ << " from '" << input
+                   << "' to '" << s << "'" << dendl;
+
+  return s;
+}
+
+bool LogMonitor::log_channel_info::do_log_to_syslog(const string &channel) {
+  string v = get_str_map_key(log_to_syslog, channel,
+                             &CLOG_CONFIG_DEFAULT_KEY);
+  // We expect booleans, but they are in k/v pairs, kept
+  // as strings, in 'log_to_syslog'. We must ensure
+  // compatibility with existing boolean handling, and so
+  // we are here using a modified version of how
+  // md_config_t::set_val_raw() handles booleans. We will
+  // accept both 'true' and 'false', but will also check for
+  // '1' and '0'. The main distiction between this and the
+  // original code is that we will assume everything not '1',
+  // '0', 'true' or 'false' to be 'false'.
+  bool ret = false;
+
+  if (boost::iequals(v, "false")) {
+    ret = false;
+  } else if (boost::iequals(v, "true")) {
+    ret = true;
+  } else {
+    std::string err;
+    int b = strict_strtol(v.c_str(), 10, &err);
+    ret = (err.empty() && b == 1);
+  }
+
+  return ret;
+}
+
+ceph::logging::Graylog::Ref LogMonitor::log_channel_info::get_graylog(
+    const string &channel)
+{
+  generic_dout(25) << __func__ << " for channel '"
+		   << channel << "'" << dendl;
+
+  if (graylogs.count(channel) == 0) {
+    auto graylog(std::make_shared<ceph::logging::Graylog>("mon"));
+
+    graylog->set_fsid(g_conf->get_val<uuid_d>("fsid"));
+    graylog->set_hostname(g_conf->host);
+    graylog->set_destination(get_str_map_key(log_to_graylog_host, channel,
+					     &CLOG_CONFIG_DEFAULT_KEY),
+			     atoi(get_str_map_key(log_to_graylog_port, channel,
+						  &CLOG_CONFIG_DEFAULT_KEY).c_str()));
+
+    graylogs[channel] = graylog;
+    generic_dout(20) << __func__ << " for channel '"
+		     << channel << "' to graylog host '"
+		     << log_to_graylog_host[channel] << ":"
+		     << log_to_graylog_port[channel]
+		     << "'" << dendl;
+  }
+  return graylogs[channel];
+}
+
+void LogMonitor::handle_conf_change(const struct md_config_t *conf,
+                                    const std::set<std::string> &changed)
+{
+  if (changed.count("mon_cluster_log_to_syslog") ||
+      changed.count("mon_cluster_log_to_syslog_level") ||
+      changed.count("mon_cluster_log_to_syslog_facility") ||
+      changed.count("mon_cluster_log_file") ||
+      changed.count("mon_cluster_log_file_level") ||
+      changed.count("mon_cluster_log_to_graylog") ||
+      changed.count("mon_cluster_log_to_graylog_host") ||
+      changed.count("mon_cluster_log_to_graylog_port")) {
+    update_log_channels();
+  }
+}