The database uses PSQL and JDBC to connect remotely and disconnect automatically from time to time

Henkel database

Catalog

Environmental Science

symptoms

Question why

Solution

Environmental Science

system platform ：Linux x86-64 Red Hat Enterprise Linux 7,Linux x86-64 Red Hat Enterprise Linux 6, Galaxy Unicorn U system （CPU Feiteng ）4

edition ：4.5

symptoms

Hangao database is in use psql Tools and jdbc When making a remote connection , Report an error after a certain time - Fatal error ：terminating connection due to client no input timeout.

Check safety parameters ,hg_clientnoinput = 0;

Question why

operating system TCP The relevant parameters are set incorrectly , The database follows the operating system configuration , Lead to TCP The survival mechanism has not taken effect .

Solution

After the database is configured as follows , Problem solving ：

Log in and copy

      
      

       
       # The default values of the following parameters are 0, Indicates the configuration of the continuation server .
       
       

       
       

       
       tcp_keepalives_idle 
       
       = 
       
       '60'
       
       

       
       

       
       tcp_keepalives_interval 
       
       = 
       
       '20'
       
       

       
       

       
       tcp_keepalives_count 
       
       = 
       
       '10'
      
      
      
      

       
       
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Parameter description ：

• ​tcp_keepalives_idle​ (​integer​) Specify that the operating system sends a TCP keepalive The total amount of time without network activity after the message . If you specify a value without a unit , In seconds . value 0( The default value is ) Indicates that the default value of the operating system is selected . Specify how many seconds to pass after inactivity TCP Send a keepalive news . 0 Value means the default value is used . This parameter is only supported ​TCP_KEEPIDLE​ Or equivalent socket option system or Windows You can only use . On other systems , It must be zero . Through Unix In the session of domain socket connection , This parameter is ignored and always read as zero .
• ​tcp_keepalives_interval​ (​integer​)
  Specify the receipt that is not confirmed by the client TCP keepalive The length of time the message should be retransmitted . If you specify a value without a unit , In seconds . value 0( The default value is ) Indicates that the default value of the operating system is selected . This parameter is only supported ​TCP_KEEPINTVL​ Or equivalent socket option system or Windows You can only use . On other systems , It has to be zero . Through Unix In the session of domain socket connection , This parameter is ignored and always read as zero .
• ​tcp_keepalives_count​ (​integer​) Specifies that the connection from the server to the client can be lost before it is considered disconnected TCP keepalive The number of messages . value 0( The default value is ) Indicates that the default value of the operating system is selected . This parameter is only supported ​TCP_KEEPCNT​ Or equivalent socket option . On other systems , It has to be zero . Through Unix In the session of domain socket connection , This parameter is ignored and always read as zero .
• ​tcp_user_timeout​ (​integer​) Specifies that the transmitted data is in TCP The amount of time that a connection can remain in an unconfirmed state before it is forcibly closed . If you specify a value without a unit , In milliseconds . value 0( The default value is ) Indicates that the default value of the operating system is selected . This parameter is only supported ​TCP_USER_TIMEOUT​ Is supported on the system ; On other systems , It must be zero . Through Unix-domain In a socket connected session , This parameter will be ignored and always read as zero .

Methods of configuration information related to the server ：

Log in and copy

      
      

       
       
[
       
       root
       
       @Server3 
       
       ~]
       
       # 
       
       cat 
       
       /
       
       proc
       
       /
       
       sys
       
       /
       
       net
       
       /
       
       ipv4
       
       /
       
       tcp_keepalive_time
       
       
[
       
       root
       
       @Server3 
       
       ~]
       
       # 
       
       cat 
       
       /
       
       proc
       
       /
       
       sys
       
       /
       
       net
       
       /
       
       ipv4
       
       /
       
       tcp_keepalive_intvl
       
       

       
       
[
       
       root
       
       @Server3 
       
       ~]
       
       # 
       
       cat 
       
       /
       
       proc
       
       /
       
       sys
       
       /
       
       net
       
       /
       
       ipv4
       
       /
       
       tcp_keepalive_probes
      
      
      
      

       
       
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