Hopefully you read through Part 1?
Install Pacemaker and Corosync on SLES 11 SP3 - Postgres streaming - Part1
When starting Corosync, the Corosync scripts should start Pacemaker as well, you can check this with the following in all the nodes
cl1_lb1:/ # ps -ef | grep corosync root 4064 1 0 07:14 ? 00:00:07 /etc/init.d/rc3.d/S11corosync start root 7594 12522 0 10:08 pts/0 00:00:00 grep corosync cl1_lb1:/ # ps -ef | grep pacemaker 90 4084 4064 0 07:14 ? 00:00:29 /usr/lib64/pacemaker/cib root 4085 4064 0 07:14 ? 00:00:01 /usr/lib64/pacemaker/stonithd root 4086 4064 0 07:14 ? 00:00:02 /usr/lib64/pacemaker/lrmd 90 4087 4064 0 07:14 ? 00:00:00 /usr/lib64/pacemaker/attrd 90 4088 4064 0 07:14 ? 00:00:00 /usr/lib64/pacemaker/pengine 90 4089 4064 0 07:14 ? 00:00:00 /usr/lib64/pacemaker/crmd root 7770 12522 0 10:08 pts/0 00:00:00 grep pacemaker cl1_lb1:/ #
Some Pacemaker commands below
cl1_lb1:/ # # crm_mon -1 Last updated: Thu Mar 13 14:18:42 2014 Last change: Thu Mar 13 13:59:14 2014 by hacluster via crmd on loadBal1 Stack: classic openais (with plugin) Current DC: loadBal1 - partition with quorum Version: 1.1.9-2db99f1 4 Nodes configured, 4 expected votes 0 Resources configured. Online: [ cl1_lb1 cl1_lb2 cl2_lb1 cl2_lb2 ] cl1_lb1:/ #
cl1_lb1:/ # crm configure show node cl1_lb1 node cl1_lb2 node cl2_lb1 node cl2_lb2 property $id="cib-bootstrap-options" \ dc-version="1.1.9-2db99f1" \ cluster-infrastructure="classic openais (with plugin)" \ expected-quorum-votes="4" cl1_lb1:/ #
Resource start-up disabled since no STONITH resources have been defined
Now there is a "problem", when verifying Pacemaker, the resources will not start up as STONITH needs to be configured, what is STONITH I hear you ask
STONITH - Shoot The Other Node In The Head
It is important to note that the use of STONITH is highly encouraged, turning it off tells the cluster to simply pretend that failed nodes are safely powered off. Some vendors will even refuse to support clusters that have it disabled.
So what happens with STONITH is that the "faulty" node will be shot in the head by the other nodes, IE power the node down, fence the node etc, for my configuration, I prefer not to use STONITH, so I will disable STONITH.
This is done as below, keep in mind it only has to be done on one node, the configuration is passed down to the other nodes
cl1_lb1:/ # crm_verify -L -V error: unpack_resources: Resource start-up disabled since no STONITH resources have been defined error: unpack_resources: Either configure some or disable STONITH with the stonith-enabled option error: unpack_resources: NOTE: Clusters with shared data need STONITH to ensure data integrity Errors found during check: config not valid cl1_lb1:/ # crm configure property stonith-enabled=false cl1_lb1:/ # crm_verify -L -V cl1_lb1:/ # crm configure show node cl1_lb1 node cl1_lb2 node cl2_lb1 node cl2_lb2 property $id="cib-bootstrap-options" \ dc-version="1.1.9-2db99f1" \ cluster-infrastructure="classic openais (with plugin)" \ expected-quorum-votes="4" \ stonith-enabled="false" cl1_lb1:/ #
So, seeing that I want to use Postgres streaming, the next step would be to install Postgres... Install Postgres on both the Master and Slave nodes
Use your favorite installer for this, mine is in /opt/app/pgdata/9.3/, my data base is created on a separate mount point called /pgtablespace
As the postgres user, create a archive directory in /pgtablespace for the streaming logfiles
cl1_lb1:/ # ls -ltr /opt/app/pgdata/9.3/ total 212 drwx------ 2 postgres dbinstall 4096 Mar 30 07:46 pg_twophase drwx------ 2 postgres dbinstall 4096 Mar 30 07:46 pg_subtrans -rw------- 1 postgres dbinstall 211 Mar 30 07:46 backup_label.old -rw------- 1 postgres dbinstall 4 Mar 30 07:46 PG_VERSION -rw-r--r-- 1 postgres dbinstall 20547 Mar 30 07:47 postgresql.conf drwx------ 2 postgres dbinstall 4096 Mar 30 07:47 pg_tblspc drwx------ 2 postgres dbinstall 4096 Mar 30 07:47 pg_stat drwx------ 2 postgres dbinstall 4096 Mar 30 07:47 pg_serial -rw------- 1 postgres dbinstall 1636 Mar 30 07:47 pg_ident.conf -rw------- 1 postgres dbinstall 3692 Mar 30 07:47 pg_hba_orig.conf -rw------- 1 postgres dbinstall 3850 Mar 30 07:47 pg_hba.conf drwx------ 2 postgres dbinstall 4096 Mar 30 07:47 pg_clog drwx------ 12 postgres dbinstall 4096 Mar 30 07:47 base -rw-r--r-- 1 postgres dbinstall 20564 Mar 30 07:48 postgresql_install.conf drwx------ 2 postgres dbinstall 4096 Mar 30 07:48 pg_snapshots drwx------ 4 postgres dbinstall 4096 Mar 30 07:48 pg_multixact -rw-r----- 1 postgres dbinstall 253 Mar 30 07:49 recovery.conf -rw------- 1 postgres dbinstall 69 Mar 30 07:49 postmaster.pid -rw------- 1 postgres dbinstall 131 Mar 30 07:49 postmaster.opts drwx------ 3 postgres dbinstall 4096 Mar 30 07:49 pg_xlog drwx------ 2 postgres dbinstall 4096 Mar 30 07:49 pg_notify drwxr-xr-x 2 postgres dbinstall 12288 Mar 30 07:49 pg_log drwx------ 2 postgres dbinstall 4096 Mar 30 07:50 global drwx------ 2 postgres dbinstall 4096 Mar 30 10:30 pg_stat_tmp cl1_lb1:/ # ls -ltr /pgtablespace total 32 drwx------ 3 postgres dbinstall 4096 Mar 30 07:46 CUSTOMER_MESSAGES drwx------ 3 postgres dbinstall 4096 Mar 30 07:46 MASTER_DATA drwxr-xr-x 2 postgres dbinstall 4096 Mar 30 07:48 archive cl1_lb1:/ #
The next step will be to configure the postgresql.conf file, on the Master machine
The following parameters were changed in the postgresql.conf file, make sure that yours look the same
cl1_lb1:/ # cat /opt/app/pgdata/9.3/postgresql.conf | grep listen_addresses listen_addresses = '*' # what IP address(es) to listen on; cl1_lb1:/ # cat /opt/app/pgdata/9.3/postgresql.conf | grep wal_level wal_level = hot_standby # minimal, archive, or hot_standby cl1_lb1:/ # cat /opt/app/pgdata/9.3/postgresql.conf | grep synchronous_commit synchronous_commit = on # synchronization level; cl1_lb1:/ # cat /opt/app/pgdata/9.3/postgresql.conf | grep archive_mode archive_mode = on # allows archiving to be done cl1_lb1:/ # cat /opt/app/pgdata/9.3/postgresql.conf | grep archive_command #archive_command = 'rsync -a %p postgres@172.16.0.5:/pgtablespace/archive/%f' archive_command = 'cp %p /pgtablespace/archive/%f' #archive_command = '' # command to use to archive a logfile segment cl1_lb1:/ # cat /opt/app/pgdata/9.3/postgresql.conf | grep max_wal_senders max_wal_senders = 5 # max number of walsender processes cl1_lb1:/ # cat /opt/app/pgdata/9.3/postgresql.conf | grep wal_keep_segments wal_keep_segments = 32 # in logfile segments, 16MB each; 0 disables cl1_lb1:/ # cat /opt/app/pgdata/9.3/postgresql.conf | grep hot_standby wal_level = hot_standby # minimal, archive, or hot_standby hot_standby = on # "on" allows queries during recovery hot_standby_feedback = on # send info from standby to prevent cl1_lb1:/ # cat /opt/app/pgdata/9.3/postgresql.conf | grep restart_after_crash restart_after_crash = off # reinitialize after backend crash? cl1_lb1:/ # cat /opt/app/pgdata/9.3/postgresql.conf | grep wal_receiver_status_interval wal_receiver_status_interval = 2s # send replies at least this often cl1_lb1:/ # cat /opt/app/pgdata/9.3/postgresql.conf | grep max_standby_streaming_delay max_standby_streaming_delay = -1 # max delay before canceling queries cl1_lb1:/ # cat /opt/app/pgdata/9.3/postgresql.conf | grep max_standby_archive_delay max_standby_archive_delay = -1 # max delay before canceling queries cl1_lb1:/ # cat /opt/app/pgdata/9.3/postgresql.conf | grep synchronous_commit synchronous_commit = on # synchronization level; cl1_lb1:/ # cat /opt/app/pgdata/9.3/postgresql.conf | grep restart_after_crash restart_after_crash = off # reinitialize after backend crash? cl1_lb1:/ # cat /opt/app/pgdata/9.3/postgresql.conf | grep hot_standby_feedback hot_standby_feedback = on # send info from standby to prevent cl1_lb1:/ #
And the complete file for reference
cl1_lb1:/ # cat /opt/app/pgdata/9.3/postgresql.conf # ----------------------------- # PostgreSQL configuration file # ----------------------------- # # This file consists of lines of the form: # # name = value # # (The "=" is optional.) Whitespace may be used. Comments are introduced with # "#" anywhere on a line. The complete list of parameter names and allowed # values can be found in the PostgreSQL documentation. # # The commented-out settings shown in this file represent the default values. # Re-commenting a setting is NOT sufficient to revert it to the default value; # you need to reload the server. # # This file is read on server startup and when the server receives a SIGHUP # signal. If you edit the file on a running system, you have to SIGHUP the # server for the changes to take effect, or use "pg_ctl reload". Some # parameters, which are marked below, require a server shutdown and restart to # take effect. # # Any parameter can also be given as a command-line option to the server, e.g., # "postgres -c log_connections=on". Some parameters can be changed at run time # with the "SET" SQL command. # # Memory units: kB = kilobytes Time units: ms = milliseconds # MB = megabytes s = seconds # GB = gigabytes min = minutes # h = hours # d = days #------------------------------------------------------------------------------ # FILE LOCATIONS #------------------------------------------------------------------------------ # The default values of these variables are driven from the -D command-line # option or PGDATA environment variable, represented here as ConfigDir. #data_directory = 'ConfigDir' # use data in another directory # (change requires restart) #hba_file = 'ConfigDir/pg_hba.conf' # host-based authentication file # (change requires restart) #ident_file = 'ConfigDir/pg_ident.conf' # ident configuration file # (change requires restart) # If external_pid_file is not explicitly set, no extra PID file is written. #external_pid_file = '' # write an extra PID file # (change requires restart) #------------------------------------------------------------------------------ # CONNECTIONS AND AUTHENTICATION #------------------------------------------------------------------------------ # - Connection Settings - listen_addresses = '*' # what IP address(es) to listen on; # comma-separated list of addresses; # defaults to 'localhost'; use '*' for all # (change requires restart) port = 5432 # (change requires restart) max_connections = 800 # Note: Increasing max_connections costs ~400 bytes of shared memory per # connection slot, plus lock space (see max_locks_per_transaction). #superuser_reserved_connections = 3 # (change requires restart) #unix_socket_directories = '/tmp' # comma-separated list of directories # (change requires restart) #unix_socket_group = '' # (change requires restart) #unix_socket_permissions = 0777 # begin with 0 to use octal notation # (change requires restart) #bonjour = off # advertise server via Bonjour # (change requires restart) #bonjour_name = '' # defaults to the computer name # (change requires restart) # - Security and Authentication - #authentication_timeout = 1min # 1s-600s #ssl = off # (change requires restart) #ssl_ciphers = 'DEFAULT:!LOW:!EXP:!MD5:@STRENGTH' # allowed SSL ciphers # (change requires restart) #ssl_renegotiation_limit = 512MB # amount of data between renegotiations #ssl_cert_file = 'server.crt' # (change requires restart) #ssl_key_file = 'server.key' # (change requires restart) #ssl_ca_file = '' # (change requires restart) #ssl_crl_file = '' # (change requires restart) #password_encryption = on #db_user_namespace = off # Kerberos and GSSAPI #krb_server_keyfile = '' #krb_srvname = 'postgres' # (Kerberos only) #krb_caseins_users = off # - TCP Keepalives - # see "man 7 tcp" for details #tcp_keepalives_idle = 0 # TCP_KEEPIDLE, in seconds; # 0 selects the system default #tcp_keepalives_interval = 0 # TCP_KEEPINTVL, in seconds; # 0 selects the system default #tcp_keepalives_count = 0 # TCP_KEEPCNT; # 0 selects the system default #------------------------------------------------------------------------------ # RESOURCE USAGE (except WAL) #------------------------------------------------------------------------------ # - Memory - shared_buffers = 1515MB # (change requires restart) temp_buffers = 8MB #max_prepared_transactions = 0 # zero disables the feature # (change requires restart) # Note: Increasing max_prepared_transactions costs ~600 bytes of shared memory # per transaction slot, plus lock space (see max_locks_per_transaction). # It is not advisable to set max_prepared_transactions nonzero unless you # actively intend to use prepared transactions. work_mem = 8MB #maintenance_work_mem = 16MB # min 1MB #max_stack_depth = 2MB # min 100kB # - Disk - #temp_file_limit = -1 # limits per-session temp file space # in kB, or -1 for no limit # - Kernel Resource Usage - #max_files_per_process = 1000 # min 25 # (change requires restart) #shared_preload_libraries = '' # (change requires restart) # - Cost-Based Vacuum Delay - #vacuum_cost_delay = 0 # 0-100 milliseconds #vacuum_cost_page_hit = 1 # 0-10000 credits #vacuum_cost_page_miss = 10 # 0-10000 credits #vacuum_cost_page_dirty = 20 # 0-10000 credits #vacuum_cost_limit = 200 # 1-10000 credits # - Background Writer - #bgwriter_delay = 200ms # 10-10000ms between rounds #bgwriter_lru_maxpages = 100 # 0-1000 max buffers written/round #bgwriter_lru_multiplier = 2.0 # 0-10.0 multipler on buffers scanned/round # - Asynchronous Behavior - #effective_io_concurrency = 1 # 1-1000; 0 disables prefetching #------------------------------------------------------------------------------ # WRITE AHEAD LOG #------------------------------------------------------------------------------ # - Settings - wal_level = hot_standby # minimal, archive, or hot_standby # (change requires restart) #fsync = on # turns forced synchronization on or off synchronous_commit = on # synchronization level; # off, local, remote_write, or on #wal_sync_method = fsync # the default is the first option # supported by the operating system: # open_datasync # fdatasync (default on Linux) # fsync # fsync_writethrough # open_sync #full_page_writes = on # recover from partial page writes wal_buffers = 64kB # min 32kB, -1 sets based on shared_buffers # (change requires restart) wal_writer_delay = 200ms # 1-10000 milliseconds commit_delay = 100 commit_siblings = 5 # range 1-1000 # - Checkpoints - checkpoint_segments = 128 #checkpoint_timeout = 5min # range 30s-1h checkpoint_completion_target = 0.9 #checkpoint_warning = 30s # 0 disables # - Archiving - archive_mode = on # allows archiving to be done # (change requires restart) archive_command = 'cp %p /pgtablespace/archive/%f' #archive_command = '' # command to use to archive a logfile segment # placeholders: %p = path of file to archive # %f = file name only # e.g. 'test ! -f /mnt/server/archivedir/%f && cp %p /mnt/server/archivedir/%f' #archive_timeout = 0 # force a logfile segment switch after this # number of seconds; 0 disables #------------------------------------------------------------------------------ # REPLICATION #------------------------------------------------------------------------------ # - Sending Server(s) - # Set these on the master and on any standby that will send replication data. max_wal_senders = 5 # max number of walsender processes # (change requires restart) wal_keep_segments = 32 # in logfile segments, 16MB each; 0 disables #wal_sender_timeout = 60s # in milliseconds; 0 disables # - Master Server - # These settings are ignored on a standby server. #synchronous_standby_names = '' # standby servers that provide sync rep # comma-separated list of application_name # from standby(s); '*' = all #vacuum_defer_cleanup_age = 0 # number of xacts by which cleanup is delayed # - Standby Servers - # These settings are ignored on a master server. hot_standby = on # "on" allows queries during recovery # (change requires restart) max_standby_archive_delay = -1 # max delay before canceling queries # when reading WAL from archive; # -1 allows indefinite delay max_standby_streaming_delay = -1 # max delay before canceling queries # when reading streaming WAL; # -1 allows indefinite delay wal_receiver_status_interval = 2s # send replies at least this often # 0 disables hot_standby_feedback = on # send info from standby to prevent # query conflicts #wal_receiver_timeout = 60s # time that receiver waits for # communication from master # in milliseconds; 0 disables #------------------------------------------------------------------------------ # QUERY TUNING #------------------------------------------------------------------------------ # - Planner Method Configuration - #enable_bitmapscan = on #enable_hashagg = on #enable_hashjoin = on #enable_indexscan = on #enable_indexonlyscan = on #enable_material = on #enable_mergejoin = on #enable_nestloop = on #enable_seqscan = on #enable_sort = on #enable_tidscan = on # - Planner Cost Constants - #seq_page_cost = 1.0 # measured on an arbitrary scale #random_page_cost = 4.0 # same scale as above #cpu_tuple_cost = 0.01 # same scale as above #cpu_index_tuple_cost = 0.005 # same scale as above #cpu_operator_cost = 0.0025 # same scale as above effective_cache_size = 4547MB # - Genetic Query Optimizer - #geqo = on #geqo_threshold = 12 #geqo_effort = 5 # range 1-10 #geqo_pool_size = 0 # selects default based on effort #geqo_generations = 0 # selects default based on effort #geqo_selection_bias = 2.0 # range 1.5-2.0 #geqo_seed = 0.0 # range 0.0-1.0 # - Other Planner Options - #default_statistics_target = 100 # range 1-10000 #constraint_exclusion = partition # on, off, or partition #cursor_tuple_fraction = 0.1 # range 0.0-1.0 #from_collapse_limit = 8 #join_collapse_limit = 8 # 1 disables collapsing of explicit # JOIN clauses #------------------------------------------------------------------------------ # ERROR REPORTING AND LOGGING #------------------------------------------------------------------------------ # - Where to Log - log_destination = 'stderr' # Valid values are combinations of # stderr, csvlog, syslog, and eventlog, # depending on platform. csvlog # requires logging_collector to be on. # This is used when logging to stderr: logging_collector = on # Enable capturing of stderr and csvlog # into log files. Required to be on for # csvlogs. # (change requires restart) # These are only used if logging_collector is on: #log_directory = 'pg_log' # directory where log files are written, # can be absolute or relative to PGDATA #log_filename = 'postgresql-%Y-%m-%d_%H%M%S.log' # log file name pattern, # can include strftime() escapes #log_file_mode = 0600 # creation mode for log files, # begin with 0 to use octal notation #log_truncate_on_rotation = off # If on, an existing log file with the # same name as the new log file will be # truncated rather than appended to. # But such truncation only occurs on # time-driven rotation, not on restarts # or size-driven rotation. Default is # off, meaning append to existing files # in all cases. #log_rotation_age = 1d # Automatic rotation of logfiles will # happen after that time. 0 disables. #log_rotation_size = 10MB # Automatic rotation of logfiles will # happen after that much log output. # 0 disables. # These are relevant when logging to syslog: #syslog_facility = 'LOCAL0' #syslog_ident = 'postgres' # This is only relevant when logging to eventlog (win32): #event_source = 'PostgreSQL' # - When to Log - #client_min_messages = notice # values in order of decreasing detail: # debug5 # debug4 # debug3 # debug2 # debug1 # log # notice # warning # error #log_min_messages = warning # values in order of decreasing detail: # debug5 # debug4 # debug3 # debug2 # debug1 # info # notice # warning # error # log # fatal # panic #log_min_error_statement = error # values in order of decreasing detail: # debug5 # debug4 # debug3 # debug2 # debug1 # info # notice # warning # error # log # fatal # panic (effectively off) #log_min_duration_statement = -1 # -1 is disabled, 0 logs all statements # and their durations, > 0 logs only # statements running at least this number # of milliseconds # - What to Log - #debug_print_parse = off #debug_print_rewritten = off #debug_print_plan = off #debug_pretty_print = on #log_checkpoints = off #log_connections = off #log_disconnections = off #log_duration = off #log_error_verbosity = default # terse, default, or verbose messages #log_hostname = off log_line_prefix = '%t ' # special values: # %a = application name # %u = user name # %d = database name # %r = remote host and port # %h = remote host # %p = process ID # %t = timestamp without milliseconds # %m = timestamp with milliseconds # %i = command tag # %e = SQL state # %c = session ID # %l = session line number # %s = session start timestamp # %v = virtual transaction ID # %x = transaction ID (0 if none) # %q = stop here in non-session # processes # %% = '%' # e.g. '<%u%%%d> ' #log_lock_waits = off # log lock waits >= deadlock_timeout #log_statement = 'none' # none, ddl, mod, all #log_temp_files = -1 # log temporary files equal or larger # than the specified size in kilobytes; # -1 disables, 0 logs all temp files log_timezone = 'America/New York' #------------------------------------------------------------------------------ # RUNTIME STATISTICS #------------------------------------------------------------------------------ # - Query/Index Statistics Collector - #track_activities = on #track_counts = on #track_io_timing = off #track_functions = none # none, pl, all #track_activity_query_size = 1024 # (change requires restart) #update_process_title = on #stats_temp_directory = 'pg_stat_tmp' # - Statistics Monitoring - #log_parser_stats = off #log_planner_stats = off #log_executor_stats = off #log_statement_stats = off #------------------------------------------------------------------------------ # AUTOVACUUM PARAMETERS #------------------------------------------------------------------------------ #autovacuum = on # Enable autovacuum subprocess? 'on' # requires track_counts to also be on. #log_autovacuum_min_duration = -1 # -1 disables, 0 logs all actions and # their durations, > 0 logs only # actions running at least this number # of milliseconds. #autovacuum_max_workers = 3 # max number of autovacuum subprocesses # (change requires restart) #autovacuum_naptime = 1min # time between autovacuum runs #autovacuum_vacuum_threshold = 50 # min number of row updates before # vacuum #autovacuum_analyze_threshold = 50 # min number of row updates before # analyze #autovacuum_vacuum_scale_factor = 0.2 # fraction of table size before vacuum #autovacuum_analyze_scale_factor = 0.1 # fraction of table size before analyze #autovacuum_freeze_max_age = 200000000 # maximum XID age before forced vacuum # (change requires restart) #autovacuum_multixact_freeze_max_age = 400000000 # maximum Multixact age # before forced vacuum # (change requires restart) #autovacuum_vacuum_cost_delay = 20ms # default vacuum cost delay for # autovacuum, in milliseconds; # -1 means use vacuum_cost_delay #autovacuum_vacuum_cost_limit = -1 # default vacuum cost limit for # autovacuum, -1 means use # vacuum_cost_limit #------------------------------------------------------------------------------ # CLIENT CONNECTION DEFAULTS #------------------------------------------------------------------------------ # - Statement Behavior - #search_path = '"$user",public' # schema names #default_tablespace = '' # a tablespace name, '' uses the default #temp_tablespaces = '' # a list of tablespace names, '' uses # only default tablespace #check_function_bodies = on #default_transaction_isolation = 'read committed' #default_transaction_read_only = off #default_transaction_deferrable = off #session_replication_role = 'origin' #statement_timeout = 0 # in milliseconds, 0 is disabled #lock_timeout = 0 # in milliseconds, 0 is disabled #vacuum_freeze_min_age = 50000000 #vacuum_freeze_table_age = 150000000 #vacuum_multixact_freeze_min_age = 5000000 #vacuum_multixact_freeze_table_age = 150000000 #bytea_output = 'hex' # hex, escape #xmlbinary = 'base64' #xmloption = 'content' # - Locale and Formatting - datestyle = 'iso, mdy' #intervalstyle = 'postgres' timezone = 'America/New York' #timezone_abbreviations = 'Default' # Select the set of available time zone # abbreviations. Currently, there are # Default # Australia # India # You can create your own file in # share/timezonesets/. #extra_float_digits = 0 # min -15, max 3 #client_encoding = sql_ascii # actually, defaults to database # encoding # These settings are initialized by initdb, but they can be changed. lc_messages = 'en_US.UTF-8' # locale for system error message # strings lc_monetary = 'en_US.UTF-8' # locale for monetary formatting lc_numeric = 'en_US.UTF-8' # locale for number formatting lc_time = 'en_US.UTF-8' # locale for time formatting # default configuration for text search default_text_search_config = 'pg_catalog.english' # - Other Defaults - #dynamic_library_path = '$libdir' #local_preload_libraries = '' #------------------------------------------------------------------------------ # LOCK MANAGEMENT #------------------------------------------------------------------------------ #deadlock_timeout = 1s max_locks_per_transaction = 200 # (change requires restart) # Note: Each lock table slot uses ~270 bytes of shared memory, and there are # max_locks_per_transaction * (max_connections + max_prepared_transactions) # lock table slots. #max_pred_locks_per_transaction = 64 # min 10 # (change requires restart) #------------------------------------------------------------------------------ # VERSION/PLATFORM COMPATIBILITY #------------------------------------------------------------------------------ # - Previous PostgreSQL Versions - #array_nulls = on #backslash_quote = safe_encoding # on, off, or safe_encoding #default_with_oids = off #escape_string_warning = on #lo_compat_privileges = off #quote_all_identifiers = off #sql_inheritance = on #standard_conforming_strings = on #synchronize_seqscans = on # - Other Platforms and Clients - #transform_null_equals = off #------------------------------------------------------------------------------ # ERROR HANDLING #------------------------------------------------------------------------------ #exit_on_error = off # terminate session on any error? restart_after_crash = off # reinitialize after backend crash? #------------------------------------------------------------------------------ # CONFIG FILE INCLUDES #------------------------------------------------------------------------------ # These options allow settings to be loaded from files other than the # default postgresql.conf. #include_dir = 'conf.d' # include files ending in '.conf' from # directory 'conf.d' #include_if_exists = 'exists.conf' # include file only if it exists #include = 'special.conf' # include file #------------------------------------------------------------------------------ # CUSTOMIZED OPTIONS #------------------------------------------------------------------------------ # Add settings for extensions here cl1_lb1:/ #
Edit the pg_hba.conf file on both the Master and Slave, this is to allow for replication and syncing
cl1_lb1:/ # cat /opt/app/pgdata/9.3/pg_hba.conf # PostgreSQL Client Authentication Configuration File # =================================================== # # Refer to the "Client Authentication" section in the PostgreSQL # documentation for a complete description of this file. A short # synopsis follows. # # This file controls: which hosts are allowed to connect, how clients # are authenticated, which PostgreSQL user names they can use, which # databases they can access. Records take one of these forms: # # local DATABASE USER METHOD [OPTIONS] # host DATABASE USER CIDR-ADDRESS METHOD [OPTIONS] # hostssl DATABASE USER CIDR-ADDRESS METHOD [OPTIONS] # hostnossl DATABASE USER CIDR-ADDRESS METHOD [OPTIONS] # # (The uppercase items must be replaced by actual values.) # # The first field is the connection type: "local" is a Unix-domain # socket, "host" is either a plain or SSL-encrypted TCP/IP socket, # "hostssl" is an SSL-encrypted TCP/IP socket, and "hostnossl" is a # plain TCP/IP socket. # # DATABASE can be "all", "sameuser", "samerole", "replication", a # database name, or a comma-separated list thereof. # # USER can be "all", a user name, a group name prefixed with "+", or a # comma-separated list thereof. In both the DATABASE and USER fields # you can also write a file name prefixed with "@" to include names # from a separate file. # # CIDR-ADDRESS specifies the set of hosts the record matches. It is # made up of an IP address and a CIDR mask that is an integer (between # 0 and 32 (IPv4) or 128 (IPv6) inclusive) that specifies the number # of significant bits in the mask. Alternatively, you can write an IP # address and netmask in separate columns to specify the set of hosts. # Instead of a CIDR-address, you can write "samehost" to match any of # the server's own IP addresses, or "samenet" to match any address in # any subnet that the server is directly connected to. # # METHOD can be "trust", "reject", "md5", "password", "gss", "sspi", # "krb5", "ident", "pam", "ldap", "radius" or "cert". Note that # "password" sends passwords in clear text; "md5" is preferred since # it sends encrypted passwords. # # OPTIONS are a set of options for the authentication in the format # NAME=VALUE. The available options depend on the different # authentication methods -- refer to the "Client Authentication" # section in the documentation for a list of which options are # available for which authentication methods. # # Database and user names containing spaces, commas, quotes and other # special characters must be quoted. Quoting one of the keywords # "all", "sameuser", "samerole" or "replication" makes the name lose # its special character, and just match a database or username with # that name. # # This file is read on server startup and when the postmaster receives # a SIGHUP signal. If you edit the file on a running system, you have # to SIGHUP the postmaster for the changes to take effect. You can # use "pg_ctl reload" to do that. # Put your actual configuration here # ---------------------------------- # # If you want to allow non-local connections, you need to add more # "host" records. In that case you will also need to make PostgreSQL # listen on a non-local interface via the listen_addresses # configuration parameter, or via the -i or -h command line switches. # TYPE DATABASE USER CIDR-ADDRESS METHOD # "local" is for Unix domain socket connections only local all all md5 # IPv4 local connections: host all all 0.0.0.1/0 md5 # IPv6 local connections: host all all ::1/128 md5 host all all 127.0.0.1/32 trust host all all 172.16.0.0/24 trust host replication all 172.16.0.0/24 trust cl1_lb1:/ #
Start Postgres on the Master only - Keep in mind that my Postgres is already setup, that's why I can use service postgres start
cl1_lb1:/ # service postgres start Starting PostgreSQL 9.3: See /opt/app/pgdata/9.3/pg_log/startup.log for details cl1_lb1:/ # cl1_lb1:/ # service postgres status pg_ctl: server is running (PID: 27508) /opt/app/PostgreSQL/9.3/bin/postgres "-D" "/opt/app/pgdata/9.3" "-c" "config_file=/opt/app/pgdata/9.3/postgresql.conf" "-p" "5432" cl1_lb1:/ #
On the SLAVE node, copy the data from the Master as the postgres user, keep the IP addresses in mind
Master cl1_lb1 - 172.16.0.1
Slave cl2_lb1 - 172.16.0.3
cl2_lb1:/ # su - postgres postgres@cl2_lb1:~> rm -rf /opt/app/pgdata/9.3/ postgres@cl2_lb1:~> rm -rf /pgtablespace rm: cannot remove `/pgtablespace': Permission denied postgres@cl2_lb1:~> pg_basebackup -h 172.16.0.1 -U postgres -D /opt/app/pgdata/9.3 -X stream -P 1030557/1030557 kB (100%), 8/8 tablespaces postgres@cl2_lb1:~> mkdir -p /pgtablespace/archive postgres@cl2_lb1:~> exit logout cl2_lb1:/ #
On the SLAVE. configure the recovery.conf file, to verify if replication works
cl2_lb1:/ # cat /opt/app/pgdata/9.3/recovery.conf standby_mode = 'on' primary_conninfo = 'host=172.16.0.1 port=5432 user=postgres application_name=cl2_lb1 keepalives_idle=60 keepalives_interval=5 keepalives_count=5' restore_command = 'cp /pgtablespace/archive/%f %p' recovery_target_timeline = 'latest' cl2_lb1:/ #
Start postgres on the Slave
cl2_lb1:/ # service postgres start Starting PostgreSQL 9.3: See /opt/app/pgdata/9.3/pg_log/startup.log for details cl2_lb1:/ # cl2_lb1:/ # service postgres status pg_ctl: server is running (PID: 27508) /opt/app/PostgreSQL/9.3/bin/postgres "-D" "/opt/app/pgdata/9.3" "-c" "config_file=/opt/app/pgdata/9.3/postgresql.conf" "-p" "5432" cl2_lb1:/ #
On the MASTER, confirm replication
cl1_lb1:/ # su - postgres postgres@cl1_lb1:~> psql -c "select client_addr,sync_state from pg_stat_replication;" client_addr | sync_state -------------+------------ 172.16.0.3 | sync (1 row) postgres@cl1_lb1:~>
Woooopee, she is running
Shutdown Postgres on both the Master and Slave
cl2_lb1:/ # service postgres stop Stopping PostgreSQL: waiting for server to shut down.... done server stopped cl2_lb1:/ #
cl1_lb1:/ # service postgres stop Stopping PostgreSQL: waiting for server to shut down.... done server stopped cl1_lb1:/ #
Go get some more coffee.......
Install Pacemaker and Corosync on SLES 11 SP3 - Postgres streaming - Part3
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