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Moxa V2401-CE [34/108] Etc nsswitch conf
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V2401/2402 Series Linux User’s Manual Managing Communications
3-7
/etc/resolv.conf
This is the most important file that you need to edit when using DNS. For example, before you
using # ntpdate time.stdtime.gov.tw to update the system time, you will need to add the DNS
server address to the file. Ask your network administrator which DNS server address you should
use. The DNS server’s IP address is specified with the nameserver command. For example, add
the following line to /etc/resolv.conf (assuming the DNS server’s IP address is 168.95.1.1):
nameserver 168.95.1.1
/etc/nsswitch.conf
This file defines the sequence of files, /etc/hosts or /etc/resolv.conf, to be read to resolve the IP
address.
The hosts line in /etc/nsswitch.conf means use /etc/host first and DNS service to resolve the
address.
MOXA:/etc# cat resolv.conf
#
# resolv.conf This file is the resolver configuration file
# See resolver(5).
#
#nameserver 192.168.1.16
nameserver 168.95.1.1
nameserver 140.115.1.31
nameserver 140.115.236.10
MOXA:/etc#
# /etc/nsswitch.conf
#
# Example configuration of GNU Name Service Switch
functionality.
# If you have the `glibc-doc-reference' and `info' packages
installed, try:
# `info libc "Name Service Switch"' for information about this
file.
passwd: compat
group: compat
shadow: compat
hosts: files dns
UID PID PPID C STIME TTY TIME CMD
root 1 0 0 18:00 ? 00:00:02 Init [2]
root 2 0 0 18:00 ? 00:00:00 [kthreadd]
root 3 2 0 18:00 ? 00:00:00 [migration/0]
root 4 2 0 18:00 ? 00:00:00 [ksoftirqd/0]
root 5 2 0 18:00 ? 00:00:00 [watchdog/0]
root 6 2 0 18:00 ? 00:00:00 [migration/1]
root 7 2 0 18:00 ? 00:00:00 [ksoftirqd/1]
Содержание
- First edition march 2010 1
- V2401 2402 series linux user s manual 1
- Www moxa com product 1
- Copyright notice 2
- Disclaimer 2
- Technical support contact information 2
- Trademarks 2
- V2401 2402 series linux user s manual 2
- Www moxa com support 2
- Table of contents 3
- Introduction 5
- Device driver 6
- Hardware 6
- Linux kernel 6
- Micro kernel 6
- Overview 6
- Protocol stack 6
- Software specifications 6
- Software components 7
- Software configuration 8
- Starting from a vga console 9
- Desktop display configuration 10
- Connecting from a telnet console 14
- Connecting from an ssh console 15
- Windows users 15
- Adjusting the system time 16
- Linux users 16
- Setting the time manually 16
- Example shell script for updating the system time periodically 17
- Ntp client 17
- Updating the time automatically 17
- Enabling and disabling daemons 18
- How to run the shell script automatically when the kernel boots up 18
- Setting the run level 22
- Cron daemon for executing scheduled commands 23
- Inserting a usb storage device into the computer 24
- Apt installing and removing packages 25
- Checking the linux version 25
- Device suspend 27
- Managing communications 28
- Changing the interfaces configuration file 30
- Changing the network settings 30
- Static ip address 30
- Adjusting ip addresses with ifconfig 31
- Dynamic ip address using dhcp 31
- Serial port operation mode 31
- Disabling the telnet ftp server 32
- Enabling the telnet ftp server 32
- Telnet ftp server 32
- Dns client 33
- Etc hostname 33
- Etc nsswitch conf 34
- Etc resolv conf 34
- Apache web server 35
- Default homepage 35
- Disabling the cgi function 35
- Saving web pages to a usb storage device 36
- Filter table includes three chains 38
- Iptables 38
- Nat table includes three chains 38
- Process 38
- Mangle table includes two chains 39
- Sub tables 39
- 13 3 13 40
- Iptables hierarchy 40
- The following figure shows the iptables hierarchy 40
- V2401 2402 series linux user s manual managing communications 40
- Iptables modules 41
- Define policy for chain rules 42
- Observe and erase chain rules 42
- Append or delete rules 43
- Nat example 44
- Nat network address translation 44
- Enabling nat at bootup 45
- Connecting to a ppp server over a simple dial up connection 46
- Ppp point to point protocol 46
- Checking the connection 47
- Connecting to a ppp server over a hard wired link 47
- Setting up a machine for incoming ppp connections 49
- Nfs network file system client 54
- Snmp simple network management protocol 55
- Ethernet bridging for private networks on different subnets 56
- Openvpn 56
- Ethernet bridging for private networks on the same subnet 61
- Routed ip 62
- Programmer guide 64
- Device api 65
- Rtc real time clock 65
- Example to get the baudrate 66
- Example to set the baudrate 66
- Baudrate inaccuracy 67
- Digital i o 67
- Special note 67
- Dio program source code file example 69
- Examples 69
- Special note 69
- System recovery 74
- Recovery environment 75
- Recovery procedure 75
- In this example m is the usb disk drive number 76
- A software component list 84
- Software component list 84
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