Postgresql监控pgwatch的搭建

一，需要环境：

You will need a handful of components to make this work:

    - Apache (webserver)　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　#apache搭建web页面
    - PHP   (scripting language)　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　 #php5
    - pgsql extension for PHP (see http://www.php.net/manual/en/book.pgsql.php)　　　　#php的pgsql的扩展支持
    - PostgreSQL  (to store the data we collect)　　　　　　　　　　　　　　　　　　　　　 #postgresql9
    - dblink (contribution module for PostgreSQL )　　　　　　　　　　　　　　　　　　　　 #dblink 数据库连接常用软件

    - For now we only support PostgreSQL >= 9.0 databases.
      Older systems cannot be monitored, however, we will
      add support for future database releases.
    

我的pgsql是yum安装的，就是为了省事，但是在安装pgwatch环境的时候费了不少劲，主要原因也是我对pgsql不太了解，才接触，所以主要讲一下yum的安装方法，编译的pgsql搭建以上环境很轻松，百度。

1，首先apache的安装一般centos都自带，没有的话yum安装就可以，讲一下遇到的一些问题。

 [root@wds00 pgwatch-1.0]# vim /etc/httpd/conf/httpd.conf
 #        Deny from all
 #    </LimitExcept>
 #</Directory>

 #
 # DirectoryIndex: sets the file that Apache will serve if a directory
 # is requested.
 #
 # The index.html.var file (a type-map) is used to deliver content-
 # negotiated documents.  The MultiViews Option can be used for the
 # same purpose, but it is much slower.
 #
 DirectoryIndex index.php index.html index.html.var     #添加index.php索引

 #
 # AccessFileName: The name of the file to look for in each directory
 # for additional configuration directives.  See also the AllowOverride
 # directive.
 #
 AccessFileName .htaccess

 #
 # The following lines prevent .htaccess and .htpasswd files from being
 # viewed by Web clients.
 #
 <Files ~ "^\.ht">
     Order allow,deny
     Deny from all
     Satisfy All
 </Files>
 ########################################
 #
 # Dynamic Shared Object (DSO) Support
 #
 # To be able to use the functionality of a module which was built as a DSO you
 # have to place corresponding `LoadModule' lines at this location so the
 # directives contained in it are actually available _before_ they are used.
 # Statically compiled modules (those listed by `httpd -l') do not need
 # to be loaded here.
 #
 # Example:
 # LoadModule foo_module modules/mod_foo.so
 #
 LoadModule auth_basic_module modules/mod_auth_basic.so
 LoadModule auth_digest_module modules/mod_auth_digest.so
 LoadModule authn_file_module modules/mod_authn_file.so
 LoadModule authn_alias_module modules/mod_authn_alias.so
 LoadModule authn_anon_module modules/mod_authn_anon.so
 LoadModule authn_dbm_module modules/mod_authn_dbm.so
 LoadModule authn_default_module modules/mod_authn_default.so
 LoadModule authz_host_module modules/mod_authz_host.so
 LoadModule authz_user_module modules/mod_authz_user.so
 LoadModule authz_owner_module modules/mod_authz_owner.so
 LoadModule authz_groupfile_module modules/mod_authz_groupfile.so
 LoadModule authz_dbm_module modules/mod_authz_dbm.so
 LoadModule authz_default_module modules/mod_authz_default.so
 LoadModule ldap_module modules/mod_ldap.so
 LoadModule authnz_ldap_module modules/mod_authnz_ldap.so
 LoadModule include_module modules/mod_include.so
 LoadModule log_config_module modules/mod_log_config.so
 LoadModule logio_module modules/mod_logio.so
 LoadModule env_module modules/mod_env.so
 LoadModule ext_filter_module modules/mod_ext_filter.so
 LoadModule mime_magic_module modules/mod_mime_magic.so
 LoadModule expires_module modules/mod_expires.so
 LoadModule deflate_module modules/mod_deflate.so
 LoadModule headers_module modules/mod_headers.so
 LoadModule usertrack_module modules/mod_usertrack.so
 LoadModule setenvif_module modules/mod_setenvif.so
 LoadModule mime_module modules/mod_mime.so
 LoadModule dav_module modules/mod_dav.so
 LoadModule status_module modules/mod_status.so
 LoadModule autoindex_module modules/mod_autoindex.so
 LoadModule info_module modules/mod_info.so
 LoadModule dav_fs_module modules/mod_dav_fs.so
 LoadModule vhost_alias_module modules/mod_vhost_alias.so
 LoadModule negotiation_module modules/mod_negotiation.so
 LoadModule dir_module modules/mod_dir.so
 LoadModule actions_module modules/mod_actions.so
 LoadModule speling_module modules/mod_speling.so
 LoadModule userdir_module modules/mod_userdir.so
 LoadModule alias_module modules/mod_alias.so
 LoadModule substitute_module modules/mod_substitute.so
 LoadModule rewrite_module modules/mod_rewrite.so
 LoadModule proxy_module modules/mod_proxy.so
 LoadModule proxy_balancer_module modules/mod_proxy_balancer.so
 LoadModule proxy_ftp_module modules/mod_proxy_ftp.so
 LoadModule proxy_http_module modules/mod_proxy_http.so
 LoadModule proxy_ajp_module modules/mod_proxy_ajp.so
 LoadModule proxy_connect_module modules/mod_proxy_connect.so
 LoadModule cache_module modules/mod_cache.so
 LoadModule suexec_module modules/mod_suexec.so
 LoadModule disk_cache_module modules/mod_disk_cache.so
 LoadModule cgi_module modules/mod_cgi.so
 LoadModule version_module modules/mod_version.so
 97 LoadModule php5_module        modules/libphp5.so　　　　#添加php模块
 ########################################
 AddType application/x-httpd-php .php
10 AddType application/x-httpd-php-source .phps  　　　　　　#添加php文件

2.安装php支持的postgresql扩展

[root@localhost config]# yum list |grep pgsql
php-pgsql.x86_64                     5.3.3-27.el6_5.1          @updates
apr-util-pgsql.x86_64                1.3.-.el6_0.           base
dovecot-pgsql.x86_64                 :2.0.-.el6_5.         updates
dspam-pgsql.x86_64                   3.10.-.el6              epel
erlang-pgsql.x86_64                  -.20101203svn.el6       epel
exim-pgsql.x86_64                    4.72-.el6                epel
gnokii-smsd-pgsql.x86_64             0.6.-.el6              epel
libdbi-dbd-pgsql.x86_64              0.8.-5.1.el6             base
libodb-pgsql.i686                    2.3.-.el6               epel
libodb-pgsql.x86_64                  2.3.-.el6               epel
libodb-pgsql-devel.i686              2.3.-.el6               epel
libodb-pgsql-devel.x86_64            2.3.-.el6               epel
mod_auth_pgsql.x86_64                2.0.-10.1.el6            base
mydns-pgsql.x86_64                   1.2.8.31-.el6            epel
nagios-plugins-pgsql.x86_64          1.4.-.el6             epel
php-pear-MDB2-Driver-pgsql.noarch    1.5.-0.8.b4.el6          epel
plpgsql_check_93.x86_64              0.9.-.rhel6             pgdg93
plpgsql_check_93-debuginfo.x86_64    0.9.-.rhel6             pgdg93
root-sql-pgsql.x86_64                5.34.-.el6             epel
rsyslog-pgsql.x86_64                 5.8.-.el6              base
trytond-pgsql.noarch                 1.8.-.el6              epel
uuid-pgsql.x86_64                    1.6.-.el6              base
zabbix-proxy-pgsql.x86_64            1.8.-.el6              epel
zabbix-server-pgsql.x86_64           1.8.-.el6              epel
zabbix-web-pgsql.noarch              1.8.-.el6              epel
zabbix20-proxy-pgsql.x86_64          2.0.-.el6              epel
zabbix20-server-pgsql.x86_64         2.0.-.el6              epel
zabbix20-web-pgsql.noarch            2.0.-.el6              epel
zabbix22-dbfiles-pgsql.noarch        2.2.-.el6               epel
zabbix22-proxy-pgsql.x86_64          2.2.-.el6               epel
zabbix22-server-pgsql.x86_64         2.2.-.el6               epel
zabbix22-web-pgsql.noarch            2.2.-.el6               epel   
[root@localhost config]# yum -y install php-pgsql.x86_64 

3.安装dblink

在网上找了很久关于yum安装dblink的资料，几乎没有，最后找到debian安装的办法，主要就是一个dblink.sql的文件。
方法如下：
[root@wds00 /]# rpm -qa |grep post
postgresql92-contrib-9.2.9-1PGDG.rhel6.x86_64
postfix-2.6.6-2.2.el6_1.x86_64
postgresql92-libs-9.2.9-1PGDG.rhel6.x86_64
postgresql92-jdbc-9.2.1002-1PGDG.rhel6.x86_64
postgresql92-9.2.9-1PGDG.rhel6.x86_64
postgresql92-server-9.2.9-1PGDG.rhel6.x86_64
[root@wds00 /]# 

[root@localhost config]# find / -name dblink*
/usr/pgsql-9.2/lib/dblink.so 　　　　　　#重要
/usr/pgsql-9.2/share/man/man3/dblink_get_result.
/usr/pgsql-9.2/share/man/man3/dblink_is_busy.
/usr/pgsql-9.2/share/man/man3/dblink_exec.
/usr/pgsql-9.2/share/man/man3/dblink.
/usr/pgsql-9.2/share/man/man3/dblink_close.
/usr/pgsql-9.2/share/man/man3/dblink_fetch.
/usr/pgsql-9.2/share/man/man3/dblink_error_message.
/usr/pgsql-9.2/share/man/man3/dblink_connect.
/usr/pgsql-9.2/share/man/man3/dblink_get_notify.
/usr/pgsql-9.2/share/man/man3/dblink_cancel_query.
/usr/pgsql-9.2/share/man/man3/dblink_build_sql_update.
/usr/pgsql-9.2/share/man/man3/dblink_build_sql_delete.
/usr/pgsql-9.2/share/man/man3/dblink_disconnect.
/usr/pgsql-9.2/share/man/man3/dblink_get_connections.
/usr/pgsql-9.2/share/man/man3/dblink_get_pkey.
/usr/pgsql-9.2/share/man/man3/dblink_build_sql_insert.
/usr/pgsql-9.2/share/man/man3/dblink_send_query.
/usr/pgsql-9.2/share/man/man3/dblink_open.
/usr/pgsql-9.2/share/man/man3/dblink_connect_u.
/usr/pgsql-9.2/share/extension/dblink.control
/usr/pgsql-9.2/share/extension/dblink--unpackaged--1.0.sql
/usr/pgsql-9.2/share/extension/dblink--1.0.sql　　　　　　#重要
[root@localhost config]# 

[root@wds00 pgwatch-1.0]# cat /usr/pgsql-9.2/share/extension/dblink--1.0.sql |psql -U postgres -h 192.168.102.43
Use "CREATE EXTENSION dblink" to load this file.

登陆数据库 执行CREATE EXTENSION dblink；成功

postgres=# CREATE EXTENSION dblink;
CREATE EXTENSION
postgres=# select extname,extversion from pg_extension;
extname | extversion
---------+------------
plpgsql | 1.0
dblink | 1.0
(2 行记录)

二，下载pgwatch安装包1.0版本。

 wget http://www.cybertec.at/download/pgwatch/pgwatch-1.0.tar.gz -O /usr/loca/src/pgwatch-1.0.tar.gz

 cd /usr/local/src/

 tar zxvf /usr/loca/src/pgwatch-1.0.tar.gz #解压

 [root@wds00 src]# ls
 pgwatch-1.0 pgwatch-1.0.tar.gz

三，修改配置文件

由于之前网上一哥们（玩命写博客）的文章给了我们很大帮助，但是他搭建的时候pgsql的版本还比较低，所以有些问题没有遇到，现在pgsql大家都用version2.0 或者version3.0版本的，所以在安装上都会遇到不出图的问题，我也一样，下面仔细说说原因与解决办法。

1，配置文件

[root@wds00 config]# pwd
/var/www/html/config
[root@wds00 config]# ls
config.ini  config.ini.template  fetch_8_4.xml  fetch_9_0.xml  fetch_9_1.xml  fetch_9_2.xml #模板文件用来生成config.ini 的，里面版本就没有9.1以上的，所以生成出来的配置文件也不能有9.1以上版本的xml文件了，里面的所有xml文件都是一个软连接，指向fetch_8_4.xml。

[root@wds00 config]# ll
总用量 32
-rw-r--r-- 1 apache apache 2289 9月 15 19:14 config.ini
-rw-r--r-- 1 apache apache 2313 9月 15 19:03 config.ini.template
-rw-r--r-- 1 apache apache 23351 9月 15 16:59 fetch_8_4.xml
lrwxrwxrwx 1 apache apache 13 9月 15 17:42 fetch_9_0.xml -> fetch_8_4.xml
lrwxrwxrwx 1 apache apache 13 9月 15 17:42 fetch_9_1.xml -> fetch_8_4.xml
lrwxrwxrwx 1 apache apache 13 9月 15 19:16 fetch_9_2.xml -> fetch_8_4.xml

[root@wds00 config]#cat config.ini.template

; When during synchronization a daily aggregation also happens for tables and indexes info.
; This variable tells the system what length of interval to reprocess.
; Must be at least 1 hour, but to avoid "holes" in data due to any syytem halts
; it's better to choose a bigger interval.
sync_agg_reprocess_interval = "2 days"

; allowed pg versions (dropdown in configure menu)
allowed_pg_versions[] = "8.4"
allowed_pg_versions[] = "9.0"
allowed_pg_versions[] = "9.1"
allowed_pg_versions[] = "9.2"　　　　#我自己后加的

; Allow caching dbrow objects for acceleration purposes, but needs more memory
allow_cache = true
###########################################################################

修改 fetch_8_4.xml，重中之重，不然你可能会sql查询报错，原因就是由于pgsql8.4与9.2  9.3这类版本不一样导致的，里面的一个 pg_stat_activity数据列名称不一样。我的是pgsql9.2

pgwatch主要就是查这个表然后统计数据在显示的，如果你连查表都出问题，更别说显示了。

feeb=# \d pg_stat_activity
View "pg_catalog.pg_stat_activity"
Column | Type | Modifiers
------------------+--------------------------+-----------
datid | oid |
datname | name |
pid | integer |
usesysid | oid |
usename | name |
application_name | text |
client_addr | inet |
client_hostname | text |
client_port | integer |
backend_start | timestamp with time zone |
xact_start | timestamp with time zone |
query_start | timestamp with time zone |
state_change | timestamp with time zone |
waiting | boolean |
state | text |
query | text |

##########################################

看一下fetch_8_4.xml文件里面怎么写的

<query debug="true" log="Retrieving t_stat_activity">
INSERT INTO raw_data.t_stat_activity
(tstamp, node_id, database_id, datid, datname, procpid, usesysid, usename, current_query,
waiting, xact_start, query_start, backend_start, client_addr, client_port)
SELECT '{{input:now}}', '{{input:node_id}}', '{{input:db_id}}', *
FROM dblink('{{input:link}}', 'SELECT datid, datname, procpid, usesysid, usename, current_query,
waiting, xact_start, query_start, backend_start, client_addr, client_port
FROM pg_catalog.pg_stat_activity WHERE datname=''{{input:dbname}}''
AND current_query!=''&lt;IDLE&gt;'' AND procpid!=pg_backend_pid()')
AS (datid oid, datname name, procpid integer, usesysid oid, usename name,
current_query text, waiting boolean, xact_start timestamp, query_start timestamp,
backend_start timestamp, client_addr inet, client_port integer)

我简单标红了几个地方，具体的我也不找了，我直接把正确的复制过来，如下：

<?xml version='1.0' standalone='yes'?>
<queries>

<query debug="true" log="Retrieving t_stat_activity">
INSERT INTO raw_data.t_stat_activity
(tstamp, node_id, database_id, datid, datname, procpid, usesysid, usename, current_query,
waiting, xact_start, query_start, backend_start, client_addr, client_port)
SELECT '{{input:now}}', '{{input:node_id}}', '{{input:db_id}}', *
FROM dblink('{{input:link}}', 'SELECT datid, datname, pid, usesysid, usename, query,
waiting, xact_start, query_start, backend_start, client_addr, client_port
FROM pg_catalog.pg_stat_activity WHERE datname=''{{input:dbname}}''
AND query!=''&lt;IDLE&gt;'' AND pid!=pg_backend_pid()')
AS (datid oid, datname name, pid integer, usesysid oid, usename name,
query text, waiting boolean, xact_start timestamp, query_start timestamp,
backend_start timestamp, client_addr inet, client_port integer)
</query>

###########################################################################

2,php文件

[root@wds00 classes]# pwd
/var/www/html/classes
[root@wds00 classes]# ls
auth.php             config_node.php  database.php  env.php               logging.php           pgwatch_smarty.php  validator.php   yui_datatable.php
chart.php            configure.php    dates.php     FusionCharts_Gen.php  log.php               pgwatch_xml.php     xmlpage.php
config_database.php  dashboard.php    dbrow.php     FusionCharts.php      pgwatch_database.php  sql_worksheet.php   xmlpageset.php

###################################

[root@wds00 classes]# cat config_database.php

// collect raw data from remote database
public function sync($now){
$node = $this->get_node();
new log("NOTICE", "Synchronizing database " . $this->database_name);
$version = preg_replace('/^(\d+\.\d+).*/', '\1', $node->version);
switch ($version){
case "8.4":
$xml_file = "config/fetch_8_4.xml";
break;
case "9.0":
$xml_file = "config/fetch_9_0.xml";
break;
case "9.1":
$xml_file = "config/fetch_9_1.xml";
break;
case "9.2":　　　　　　　　　　　　　　#此处自行添加。
$xml_file = "config/fetch_9_2.xml";
break;

三，完成以上修改之后就可以运行setup.php了，生成配置文件，配置数据库链接，添加计划任务定时收集数据。

0 * * * * cd/var/www/html/util && /usr/bin/php getraw_d.php

感谢QQ好友-等等路人（370508695），欢迎交流，如有错误希望能留言指出，我会及时修改，谢谢支持。

请珍惜别人的劳动转载请指明出处谢谢

官网监控推荐：http://wiki.postgresql.org/wiki/Monitoring

参考博客：http://blog.csdn.net/lengzijian/article/details/8127207