2019独角兽企业重金招聘Python工程师标准>>> 
#修改服务配置文件
我准备配置成这样:
- 输出格式为csv,这样可以方便使用或者导入到表中查询.
- 日志只保留一个月.
- 每天至少新生产一个日志.
- 一旦一个日志满100M,就生成新的日志文件,防止过大.
修改下列参数并重启生效:
[postgres@fnddb pgsql]$ cd $PGDATA
[postgres@fnddb data]$ vi postgresql.conf
......
log_destination = 'csvlog' # Valid values are combinations of
logging_collector = on # Enable capturing of stderr and csvlog
log_directory = 'pg_log' # directory where log files are written,
log_filename = 'postgresql-%d_%H%M%S.log' # log file name pattern,
log_file_mode = 0600 # creation mode for log files,
log_truncate_on_rotation = on # If on, an existing log file with the
log_rotation_age = 1d # Automatic rotation of logfiles will
log_rotation_size = 100MB # Automatic rotation of logfiles will
......
:wq
[postgres@fnddb data]$ pg_ctl reload
server signaled
找到之前重定向的日志文件查看
[postgres@fnddb data]$ cd ..
[postgres@fnddb pgsql]$ pwd
/var/lib/pgsql
[postgres@fnddb pgsql]$ ls
data pgsql.log tsdata tsdata01 tsdata02
[postgres@fnddb pgsql]$ tail -f pgsql.log
......
LOG: received SIGHUP, reloading configuration files
LOG: parameter "log_destination" changed to "csvlog"
LOG: parameter "logging_collector" cannot be changed without restarting the server
LOG: parameter "log_filename" changed to "postgresql-%d_%H%M%S.log"
LOG: parameter "log_truncate_on_rotation" changed to "on"
LOG: parameter "log_rotation_size" changed to "100MB"
LOG: configuration file "/var/lib/pgsql/data/postgresql.conf" contains errors; unaffected changes were applied
^C
logging_collector参数必须要重启才能生效.我们重启一下.
[postgres@fnddb pgsql]$ pg_ctl restart
waiting for server to shut down.... done
server stopped
server starting
[postgres@fnddb pgsql]$ LOG: redirecting log output to logging collector process
HINT: Future log output will appear in directory "pg_log".
控制台提示了之后的日志将会放在pg_log目录下.
[postgres@fnddb pg_log]$ cd $PGDATA/pg_log
[postgres@fnddb pg_log]$ ll
total 8
-rw-------. 1 postgres postgres 936 Feb 11 21:49 postgresql-11_200630.csv
-rw-------. 1 postgres postgres 96 Feb 11 20:06 postgresql-11_200630.log
#把日志文件导入到table中测试
官方文档给了个默认csv格式的表,我们来测试一下
[postgres@fnddb pg_log]$ psql -U hippo database1
psql (9.4.1)
Type "help" for help.
database1=> CREATE TABLE postgres_log
database1-> (
database1(> log_time timestamp(3) with time zone,
database1(> user_name text,
database1(> database_name text,
database1(> process_id integer,
database1(> connection_from text,
database1(> session_id text,
database1(> session_line_num bigint,
database1(> command_tag text,
database1(> session_start_time timestamp with time zone,
database1(> virtual_transaction_id text,
database1(> transaction_id bigint,
database1(> error_severity text,
database1(> sql_state_code text,
database1(> message text,
database1(> detail text,
database1(> hint text,
database1(> internal_query text,
database1(> internal_query_pos integer,
database1(> context text,
database1(> query text,
database1(> query_pos integer,
database1(> location text,
database1(> application_name text,
database1(> PRIMARY KEY (session_id, session_line_num)
database1(> );
CREATE TABLE
database1=> COPY postgres_log FROM '/var/lib/postgres/data/pg_log/postgresql-11_200630.csv' WITH csv; --copy命令只能superuser来使用
ERROR: must be superuser to COPY to or from a file
HINT: Anyone can COPY to stdout or from stdin. psql's \copy command also works for anyone.
使用\copy命令再执行下
database1=> \copy postgres_log FROM '/var/lib/pgsql/data/pg_log/postgresql-11_200630.csv' WITH csv;
COPY 7
database1=> \x
Expanded display is on.
database1=> select * from postgres_log;
-[ RECORD 1 ]----------+------------------------------------------------------------------------------------------
log_time | 2015-02-12 10:06:30.654+08
user_name |
database_name |
process_id | 24167
connection_from |
session_id | 54db45c6.5e67
session_line_num | 1
command_tag |
session_start_time | 2015-02-12 10:06:30+08
virtual_transaction_id |
transaction_id | 0
error_severity | LOG
sql_state_code | 00000
message | ending log output to stderr
detail |
hint | Future log output will go to log destination "csvlog".
internal_query |
internal_query_pos |
context |
query |
query_pos |
location |
application_name |
-[ RECORD 2 ]----------+------------------------------------------------------------------------------------------
log_time | 2015-02-12 10:06:30.657+08
......
#关于log相关参数
[postgres@fnddb pg_log]$ grep -E '^#?log' $PGDATA/postgresql.conf
log_destination = 'csvlog' # Valid values are combinations of
logging_collector = on # Enable capturing of stderr and csvlog
log_directory = 'pg_log' # directory where log files are written,
log_filename = 'postgresql-%d_%H%M%S.log' # log file name pattern,
log_file_mode = 0600 # creation mode for log files,
log_truncate_on_rotation = on # If on, an existing log file with the
log_rotation_age = 1d # Automatic rotation of logfiles will
log_rotation_size = 100MB # Automatic rotation of logfiles will
#log_min_messages = warning # values in order of decreasing detail:
#log_min_error_statement = error # values in order of decreasing detail:
#log_min_duration_statement = -1 # -1 is disabled, 0 logs all statements
#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 = '' # special values:
log_lock_waits = on # log lock waits >= deadlock_timeout
#log_statement = 'none' # none, ddl, mod, all
#log_temp_files = -1 # log temporary files equal or larger
log_timezone = 'PRC'
#log_parser_stats = off
#log_planner_stats = off
#log_executor_stats = off
#log_statement_stats = off
#log_autovacuum_min_duration = -1 # -1 disables, 0 logs all actions and
BTW,我的服务器时间超前了;)
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