我正在使用Ubuntu 16.04和Postgres 9.5
我正在使用postgres.conf中的设置，现在我的网站出现以下日志时出现500错误：
OperationalError at /
could not connect to server: Connection refused
Is the server running on host "localhost" (127.0.0.1) and accepting
TCP/IP connections on port 5432?
当我运行sudo -u postgres psql时，我收到以下错误：
psql: could not connect to server: No such file or directory
Is the server running locally and accepting
connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432"?
我收到this question的类似错误，但没有答案。 postmaster.pid对我来说不存在。
我的Postgres服务器日志的最后一位是：
2018-02-20 17:39:12 UTC [1558-2] LOG: autovacuum launcher shutting down
2018-02-20 17:39:12 UTC [1546-2] LOG: received smart shutdown request
2018-02-20 17:39:12 UTC [1989-1] postgres@postgres FATAL: terminating connection due to administrator command
2018-02-20 17:39:12 UTC [1971-1] postgres@postgres FATAL: terminating connection due to administrator command
2018-02-20 17:39:12 UTC [1555-1] LOG: shutting down
2018-02-20 17:39:12 UTC [1555-2] LOG: database system is shut down
这是执行sudo systemctl status postgresql后的日志：
● postgresql.service - PostgreSQL RDBMS
Loaded: loaded (/lib/systemd/system/postgresql.service; enabled; vendor prese
Active: active (exited) since Tue 2018-02-20 18:25:22 UTC; 23min ago
Main PID: 1766 (code=exited, status=0/SUCCESS)
Tasks: 0
Memory: 0B
CPU: 0
CGroup: /system.slice/postgresql.service
Feb 20 18:25:22 ubuntu-bungol-v0 systemd[1]: Starting PostgreSQL RDBMS...
Feb 20 18:25:22 ubuntu-bungol-v0 systemd[1]: Started PostgreSQL RDBMS.
Feb 20 18:47:57 ubuntu-bungol-v0 systemd[1]: Started PostgreSQL RDBMS.
Feb 20 18:48:15 ubuntu-bungol-v0 systemd[1]: Started PostgreSQL RDBMS.
sudo systemctl restart postgres不起作用。 sudo systemctl start postgres或sudo systemctl enable postgres
grep -Ev '^$|^\s*#' postgresql.conf and systemctl status postgresql@9.5-main.service或grep: postgresql.conf: No such file or directory
grep: and: No such file or directory
grep: systemctl: No such file or directory
grep: status: No such file or directory
grep: postgresql@9.5-main.service: No such file or directory
我没有想法。任何人都可以提供一些解决方案吗？
编辑：
sudo ps aux |grep postgres的结果：
root 1728 0.0 0.3 51420 3932 pts/0 T 18:22 0:00 sudo systemctl status postgresql
root 1729 0.0 0.3 24888 3316 pts/0 T 18:22 0:00 systemctl status postgresql
root 1733 0.0 0.3 51420 3760 pts/0 T 18:24 0:00 sudo systemctl status postgresql
root 1734 0.0 0.3 24888 3372 pts/0 T 18:24 0:00 systemctl status postgresql
valachio 1782 0.0 0.2 13112 2912 pts/0 T 18:28 0:00 nano /usr/local/var/log/postgres.log
valachio 1783 0.0 0.2 13112 2940 pts/0 T 18:28 0:00 nano /usr/local/var/postgres/server.log
root 2058 0.0 0.3 51420 3840 pts/0 T 19:35 0:00 sudo systemctl status postgresql@9.5-main.service
root 2059 0.0 0.3 24888 3368 pts/0 T 19:35 0:00 systemctl status postgresql@9.5-main.service
valachio 2225 0.0 0.0 12944 924 pts/0 R+ 19:43 0:00 grep --color=auto postgres
sudo ls -la /var/run/postgresql/的结果：
total 0
drwxrwsr-x 3 postgres postgres 60 Feb 20 19:41 .
drwxr-xr-x 25 root root 940 Feb 20 19:43 ..
drwxr-s--- 2 postgres postgres 40 Feb 20 19:41 9.5-main.pg_stat_tmp
grep -Ev '^$|^\s*#' /etc/postgresql/9.5/main/postgresql.conf的结果：
data_directory = '/var/lib/postgresql/9.5/main' # use data in another directory
hba_file = '/etc/postgresql/9.5/main/pg_hba.conf' # host-based authentication file
ident_file = '/etc/postgresql/9.5/main/pg_ident.conf' # ident configuration file
external_pid_file = '/var/run/postgresql/9.5-main.pid' # write an extra PID file
port = 5432 # (change requires restart)
max_connections = 100 # (change requires restart)
unix_socket_directories = '/var/run/postgresql' # comma-separated list of directories
ssl = true # (change requires restart)
ssl_cert_file = '/etc/ssl/certs/ssl-cert-snakeoil.pem' # (change requires restart)
ssl_key_file = '/etc/ssl/private/ssl-cert-snakeoil.key' # (change requires restart)
shared_buffers = 256MB # min 128kB
dynamic_shared_memory_type = posix # the default is the first option
log_line_prefix = '%t [%p-%l] %q%u@%d ' # special values:
log_timezone = 'UTC'
stats_temp_directory = '/var/run/postgresql/9.5-main.pg_stat_tmp'
datestyle = 'iso, mdy'
timezone = 'UTC'
lc_messages = 'en_US.UTF-8' # locale for system error message
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_text_search_config = 'pg_catalog.english'
sudo systemctl status postgresql@9.5-main.service
● postgresql@9.5-main.service - PostgreSQL Cluster 9.5-main
Loaded: loaded (/lib/systemd/system/postgresql@.service; disabled; vendor preset: enabled)
Active: failed (Result: exit-code) since Tue 2018-02-20 19:42:11 UTC; 5min ago
Process: 2135 ExecStart=postgresql@%i --skip-systemctl-redirect %i start (code=exited, status=1/FAILURE)
Feb 20 19:41:41 ubuntu-bungol-v0 systemd[1]: Starting PostgreSQL Cluster 9.5-main...
Feb 20 19:42:11 ubuntu-bungol-v0 postgresql@9.5-main[2135]: The PostgreSQL server failed to start. Please check the log output.
Feb 20 19:42:11 ubuntu-bungol-v0 systemd[1]: postgresql@9.5-main.service: Control process exited, code=exited status=1
Feb 20 19:42:11 ubuntu-bungol-v0 systemd[1]: Failed to start PostgreSQL Cluster 9.5-main.
Feb 20 19:42:11 ubuntu-bungol-v0 systemd[1]: postgresql@9.5-main.service: Unit entered failed state.
Feb 20 19:42:11 ubuntu-bungol-v0 systemd[1]: postgresql@9.5-main.service: Failed with result 'exit-code'.
row_id varchar(4000) --> created by a trigger everytime a row is inserted into the 'LOAD' table
UTCOffset Number
Data_Date Varchar2(7)
Data_Type Varchar2(4)
PostedValue Varchar2(4000)
UTCValue Timestamp(6)
Hour Number
Data_Code Varchar2(5)
的结果（日志输出保持与以前相同）：
Value_id --> created by a trigger everytime a row is inserted into the 'LOAD' table
Product_Id NUMBER
Source_Id Number
Unit_Cd Varchar2(50)
VALUE_TX VARCHAR2(4000)
UTC_Offset (Number)
Data_date (VARCHAR2(7))
HR_UTC VARCHAR2(4)
HR Timestamp(6)
HR_num Number
Data_Code Varchar2(5)
Create_Dt (autogenerated?)
Create_User_id (autogenerated)
Modify_dt (always null)
Modify_user_id (always null)
effective_dt (always null)
inactive_dt (always null)