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>Chapter 16. Operating System Environment</H1
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><B
>Table of Contents</B
></DT
><DT
>16.1. <A
HREF="runtime.html#POSTGRES-USER"
>The <SPAN
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>PostgreSQL</SPAN
> User Account</A
></DT
><DT
>16.2. <A
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>Creating a Database Cluster</A
></DT
><DT
>16.3. <A
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>Starting the Database Server</A
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>16.3.1. <A
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>Server Start-up Failures</A
></DT
><DT
>16.3.2. <A
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>Client Connection Problems</A
></DT
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>16.4. <A
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>Managing Kernel Resources</A
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>16.4.1. <A
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>Shared Memory and Semaphores</A
></DT
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>16.4.2. <A
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>Resource Limits</A
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><DT
>16.4.3. <A
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>Linux Memory Overcommit</A
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> Tunnels</A
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><P
>  This chapter discusses how to set up and run the database server
  and its interactions with the operating system.
 </P
><DIV
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><H1
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><A
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>16.1. The <SPAN
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>PostgreSQL</SPAN
> User Account</A
></H1
><A
NAME="AEN17483"
></A
><P
>   As with any other server daemon that is accessible to the outside world,
   it is advisable to run <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> under a
   separate user account. This user account should only own the data
   that is managed by the server, and should not be shared with other
   daemons. (For example, using the user <TT
CLASS="LITERAL"
>nobody</TT
> is a bad
   idea.) It is not advisable to install executables owned by this 
   user because compromised systems could then modify their own 
   binaries.
  </P
><P
>   To add a Unix user account to your system, look for a command
   <TT
CLASS="COMMAND"
>useradd</TT
> or <TT
CLASS="COMMAND"
>adduser</TT
>. The user
   name <SPAN
CLASS="SYSTEMITEM"
>postgres</SPAN
> is often used, and is assumed
   throughout this book, but you can use another name if you like.
  </P
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