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• OpenVPN useradd error

  - by zfz

  I tried to install an OpenVPN access server in Centos 6 on a linode VPS. The installation is okay for my ubuntu 11.10 distro in another VPS. The installation error occours when adding the user "openvpn" in Centos. The error message is "useradd: canot open /etc/passwd" The detail of My "/etc/passwd" file: "-rw-r--r-- 1 root root 1194 Oct 9 00:33 /etc/passwd" I am not quite familiar with Centos, so how can I add the user "openvpn" in order to setup the VPN service? Thanks.

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• OpenVPN useradd error

  - by zfz

  I tried to install an OpenVPN access server in Centos 6 on a linode VPS. The installation error occours when adding the user "openvpn". However, the installation is okay for my ubuntu 11.10 distro in another VPS. The error message is "useradd: canot open /etc/passwd" The detail of My "/etc/passwd" file: "-rw-r--r-- 1 root root 1194 Oct 9 00:33 /etc/passwd" So how can I add the user "openvpn" to setup the VPN service? Thanks.

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• How to understand the functional programming code for converting IP string to a number?

  - by zfz

  In a python discusion, I saw a way to convert IP string to a integer in functional progamming way. Here is the Link . The function is implemented in a single line. def ipnumber(ip): return reduce(lambda sum, chunk: sum <<8 | chunk, map(int, ip.split("."))) However, I have few ideas of funcional programming. Could anybody explain the function in detail? I've some knowledg of "map" and "reduce". But I don't konw what "|" and "chunk" mean here? Thanks.

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