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  • How are PID's generated?

    - by Helltone
    On *nix, PIDs are unique identifiers for running processes. How are PID's generated? Is it just an integer which gets incremented or a more complex structure such as a list? How do they get recycled? By recycling I mean that, when a process terminates, it's PID will eventually be reused by another process.

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  • How to send emails and avoid them being classified as spam

    - by Uwe
    Hello, sometimes I want to send newsletters to my customers. The problem is, that some of the emails get caught as spam messages. Mostly by Outlook at the client (even in my own Outlook 2007). Now I want to know what should be done to create "good" emails. I know about reverse lookup etc., but what about a unsubscribe link with an unique ID does that increase a spam rating? Regards, Uwe

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  • OpenDNS IP Conflict

    - by Paddy
    I have downloaded the OpenDNS client and it was working great till today. Shows me this error: dynamic IP update failed with message !yours or "Your IP address is taken by another user." I am pretty sure i'll get away with the problem by just restarting my connection as i'll be assigned a new dynamic ip. But I wonder how this is happening in the first place. Shouldn't Dynamic IP be unique for everyone?

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  • Nginx: Can I cache a URL matching a pattern at a different URL?

    - by Josh French
    I have a site with some URLs that look like this: /prefix/ID, where /prefix is static and ID is unique. Using Nginx as a reverse proxy, I'd like to cache these pages at the /ID portion only, omitting the prefix. Can I configure Nginx so that a request for the original URL is cached at the shortened URL? I tried this (I'm omitting some irrelevant parts) but obviously it's not the correct solution: http { map $request_uri $page_id { default $request_uri; ~^/prefix/(?<id>.+)$ $id; } location / { proxy_cache_key $page_id } }

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  • Alternatives to native LDAP

    - by Matt
    We've implemented an LDAP to NIS solution and have begun transitioning some systems to native LDAP binding for authentication and automount maps. Unfortunately we have a very mixed environment with more than 20 *nix environments. The setup for each variant is of course unique and has required various workarounds to get full functionality. We're now at the point where we're willing to revisit the solution and possibly migrate toward something like Likewise (http://www.likewise.org), but would like to know what others are using to solve this problem.

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  • How common (or uncommon) is using full email address for email login?

    - by somecallmemike
    I was hoping you fine folks could comment on your experiences with using a full email address as a login name for an email service vs. using the username (everything before the @domain.tld). I ask because I have inherited a legacy email system in which usernames are completely unique, and users can log in via that username (to other services besides email as well) and I do not want to ask tens of thousands of users to have to update their email settings to support virtual domain hosting without good reason.

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  • Assign fixed IP address via DHCP by DNS lookup

    - by Janoszen
    Preface I'm building a virtualization environment with Ubuntu 14.04 and LXC. I don't want to write my own template since the upgrade from 12.04 to 14.04 has shown that backwards compatibility is not guaranteed. Therefore I'm deploying my virtual machines via lxc-create, using the default Ubuntu template. The DNS for the servers is provided by Amazon Route 53, so no local DNS server is needed. I also use Puppet to configure my servers, so I want to keep the manual effort on the deployment minimal. Now, the default Ubuntu template assigns IP addresses via DHCP. Therefore, I need a local DHCP server to assign IP addresses to the nodes, so I can SSH into them and get Puppet running. Since Puppet requires a proper DNS setup, assigning temporary IP addresses is not an option, the client needs to get the right hostname and IP address from the start. Question What DHCP server do I use and how do I get it to assign the IP address based only on the host-name DHCP option by performing a DNS lookup on that very host name? What I've tried I tried to make it work using the ISC DHCP server, however, the manual clearly states: Please be aware that only the dhcp-client-identifier option and the hardware address can be used to match a host declaration, or the host-identifier option parameter for DHCPv6 servers. For example, it is not possible to match a host declaration to a host-name option. This is because the host-name option cannot be guaranteed to be unique for any given client, whereas both the hardware address and dhcp-client-identifier option are at least theoretically guaranteed to be unique to a given client. I also tried to create a class that matches the hostname like this: class "my-client-name" { match if option host-name = "my-client-name"; fixed-address my-client-name.my-domain.com; } Unfortunately the fixed-address option is not allowed in class statements. I can replace it with a 1-size pool, which works as expected: subnet 10.103.0.0 netmask 255.255.0.0 { option routers 10.103.1.1; class "my-client-name" { match if option host-name = "my-client-name"; } pool { allow members of "my-client-name"; range 10.103.1.2 10.103.1.2; } } However, this would require me to administer the IP addresses in two places (Amazon Route53 and the DHCP server), which I would prefer not to do. About security Since this is only used in the bootstrapping phase on an internal network and is then replaced by a static network configuration by Puppet, this shouldn't be an issue from a security standpoint. I am, however, aware that the virtual machine bootstraps with "ubuntu:ubuntu" credentials, which I intend to fix once this is running.

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  • Batch update users on Active Directory

    - by FrancisV
    We have around 1000 users in the Active Directory (on Windows 2008 R2) and we would like to batch update a field (student/employee ID number) from the school management system into their existing Active Directory accounts. Obviously, each student/employee ID is unique and needs to be matched to their current Active Directory account. How can this be done? Is there a tool available for this purpose?

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  • Password best practices

    - by pcampbell
    Given the recent events with a 'hacker' learning and retrying passwords from website administrators, what can we suggest to everyone about best practices when it comes to passwords? use unique passwords between sites (i.e. never re-use a password) words found in the dictionary are to be avoided consider using words or phrases from a non-English language use pass phrases and use the first letter of each word l33tifying doesn't help very much Please suggest more!

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  • want to create unqiue sub domain for my reseller with out cpanel [on hold]

    - by hemant kumar
    I have the Reselling service and i am providing unique website for reseller like resellerclub reselling service. i don't know how i can create sub domain for reseller. example customer 1 username of customer 1= hemant and i want to that if customer or anyone open there account that should be like www.hemant.myservice.com i read somewhere for code through php but it is working please help me thanks

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  • Duplicate IIS web site with Web Deploy

    - by gsantovena
    I have a Win2008 server with IIS 7 and I want to duplicate one web site and just change the binding port and the application pool that is using, so I will have 2 web sites (locally or remote) with same configuration but listening on different ports. Is there a way to do this with web deploy tool ir order to deploy locally and remotely this unique web site and change the binding ports in the destination?

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  • Index a set of files to search their text quickly?

    - by Ricket
    I have a unique need: I am frequently searching a large set of text files for a keyword. Right now, I open up Notepad++ and use the "Find in files" feature. It works just fine, but with the amount of files, each search takes several minutes to complete. Is there a good program more suited for this purpose, perhaps that indexes a set of files and then lets you search the set repeatedly and very quickly? It would greatly speed up my workflow.

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  • Setting Up a Virtual Sound Device To Stream Output via TCP/IP

    - by Martindale
    I'm interested in installing a custom driver / device that will open a socket (or listen) and stream audio via TCP/IP in both Windows and Linux. I would like to be able to specify this device as my "Output" for specific applications so that I can route my audio through a completely unique machine (for example, in complex Synergy setups where my headphones might be connected to one machine, but audio is being generated by another.) In Linux, I expect this to be very easy, but I anticipate having to install a custom driver in Windows.

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  • Letting users make their own dns changes? Any software available to manage this tricky situation?

    - by Jaredk
    I currently waste a lot of time making dns changes for my organization. DDNS of course helps for workstations, but we still have a few thousand unique servers with still more applications needing cname records that DHCP/DDNS alone will not support, so someone needs to make updates, but I'd like to see sysadmins make their own dns updates for their machines. I'm currently working on extending our asset database to support this functionality, but I hold out hope that there are COTS solutions available.

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  • Identify OpenVZ virtual machine from inside

    - by Alfred Godoy
    Is there any way for me to identify which OpenVZ container I am in, from inside the container? I am working on a setup where OpenVZ machines shall boot the same (read-only) disk image, so I can not configure them individually in the file system. I need a unique identification for each of the virtual servers, to be used by scripts running inside the OpenVZ containers. (I'm running Debian Lenny, BTW.)

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  • Assign fixed IP address via DHCP by DNS lookup

    - by Janoszen
    Preface I'm building a virtualization environment with Ubuntu 14.04 and LXC. I don't want to write my own template since the upgrade from 12.04 to 14.04 has shown that backwards compatibility is not guaranteed. Therefore I'm deploying my virtual machines via lxc-create, using the default Ubuntu template. The DNS for the servers is provided by Amazon Route 53, so no local DNS server is needed. I also use Puppet to configure my servers, so I want to keep the manual effort on the deployment minimal. Now, the default Ubuntu template assigns IP addresses via DHCP. Therefore, I need a local DHCP server to assign IP addresses to the nodes, so I can SSH into them and get Puppet running. Since Puppet requires a proper DNS setup, assigning temporary IP addresses is not an option, the client needs to get the right hostname and IP address from the start. Question What DHCP server do I use and how do I get it to assign the IP address based only on the host-name DHCP option by performing a DNS lookup on that very host name? What I've tried I tried to make it work using the ISC DHCP server, however, the manual clearly states: Please be aware that only the dhcp-client-identifier option and the hardware address can be used to match a host declaration, or the host-identifier option parameter for DHCPv6 servers. For example, it is not possible to match a host declaration to a host-name option. This is because the host-name option cannot be guaranteed to be unique for any given client, whereas both the hardware address and dhcp-client-identifier option are at least theoretically guaranteed to be unique to a given client. I also tried to create a class that matches the hostname like this: class "my-client-name" { match if option host-name = "my-client-name"; fixed-address my-client-name.my-domain.com; } Unfortunately the fixed-address option is not allowed in class statements. I can replace it with a 1-size pool, which works as expected: subnet 10.103.0.0 netmask 255.255.0.0 { option routers 10.103.1.1; class "my-client-name" { match if option host-name = "my-client-name"; } pool { allow members of "my-client-name"; range 10.103.1.2 10.103.1.2; } } However, this would require me to administer the IP addresses in two places (Amazon Route53 and the DHCP server), which I would prefer not to do. About security Since this is only used in the bootstrapping phase on an internal network and is then replaced by a static network configuration by Puppet, this shouldn't be an issue from a security standpoint. I am, however, aware that the virtual machine bootstraps with "ubuntu:ubuntu" credentials, which I intend to fix once this is running.

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  • SNMP Traps: Telling the difference between sources

    - by MHibbin
    I am logging all incoming SNMP traps to file, for further processing, via: snmptrapd -Lf /path/to/my/file.log So this will log all traps coming in on port 162. Is there a way I can tell the differences between different sources, i.e vendors. I believe this would be the "OID" field but i'm unsure. Any thoughts would be welcomed, if not I will just have to use a lookup with IP addresses, but I'm sure I saw that there is a unique part to each vendor. Cheers

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  • Play music by Operator in asterisk?

    - by Rev
    Hi I want in call duration between operator and caller,play sound for operator(something like hold music). But in order to play this sound, operator must dial unique code and then sound will be play for caller, and caller only hear that sound file! After that (sound fully played), caller back to operator's queue or something like this. So is this possible to do or not? (if possible, post dial-plan for this too)

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  • Play music by Operator in asterisk?

    - by Rev
    Hi I want in call duration between operator and caller,play sound for operator(something like hold music). But in order to play this sound, operator must dial unique code and then sound will be play for caller, and caller only hear that sound file! After that (sound fully played), caller back to operator's queue or something like this. So is this possible to do or not? (if possible, post dial-plan for this too)

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  • I have a sheet that has 2 cols; in one is the name, in the other there are one or more emails, separed by comma

    - by Totty
    I have an Excel worksheet that has two columns, in one is the name, in the other there are one or more emails, separated by a comma. Now, I want to get two columns with repeated names but unique emails, so no more than one email address in a single cell, I just want column one to have a name and column two to have an email. Now it is like this: name1 email1, email2, email3 name2 email1 name3 email1, email2 And I want it like this: name1 email1 name1 email2 name1 email3 name2 email1 name3 email1 name3 email2 thanks

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  • Architectural advice - web camera remote access

    - by Alan Hollis
    I'm looking for architectural advice. I have a client who I've built a website for which essentially allows users to view their web cameras remotely. The current flow of data is as follows: User opens page to view web camera image. Javascript script polls url on server ( appended with unique timestamp ) every 1000ms Ftp connection is enabled for the cameras ftp user. Web camera opens ftp connection to server. Web camera begins taking photos. Web camera sends photo to ftp server. On image url request: Server reads latest image on hard drive uploaded via ftp for camera. Server deleted any older images from the server. This is working okay at the moment for a small amount of users/cameras ( about 10 users and around the same amount of cameras), but we're starting to worrying about the scalability of this approach. My original plan was instead of having the files read from the server, the web server would open up an ftp connection to the web server and read the latest images directly from there meaning we should have been able to scale horizontally fairly easily. But ftp connection establishment times were too slow ( mainly due to the fact that PHP out of the ox is unable to persist ftp connections ) and so we abandoned this approach and went straight for reading from the hard drive. The firmware provider for the cameras state they're able to build a http client which instead of using ftp to upload the image could post the image to a web server. This seems plausible enough to me, but I'm looking for some architectural advice. My current thought is a simple Nginx/PHP/Redis stack. Web camera issues post requests of latest image to Nginx/PHP and the latest image for that camera is stored in Redis. The clients can then pull the latest image from Redis which should be extremely quick as the images will always be stored in memory. The data flow would then become: User opens page to view web camera image. Javascript script polls url on server ( appended with unique timestamp ) every 1000ms Camera is sent an http request to start posting images to a provided url Web camera begins taking photos. Web camera sends post requests to server as fast as it can On image url request: Server reads latest image from redis Server tells redis to delete later image My questions are: Are there any greater overheads of transferring images via HTTP instead of FTP? Is there a simple way to calculate how many potential cameras we could have streaming at once? Is there any way to prevent potentially DOS'ing our own servers due to web camera requests? Is Redis a good solution to this problem? Should I abandon PHP/Ngix combination and go for something else? Is this proposed solution actually any good? Will adding HTTPs to the mix cause posting the image to become too slow? Thanks in advance Alan

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