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  • Screen multiuser - Permission denied

    - by Zlug
    I'm trying to send input to a screen session from php. So far I have followed the steps explained here Is running GNU Screen suid root the only way to make multiuser mode work? And I have set "multiuser on" and "acladd www-data" in the screenrc file (or well, no. in another file that I use by the -c option but still) My problem now is that whenever i try to acess screen by php exec('screen -S user/session -p 0 -X stuff "test"'."\n", $ret); I get the error: Cannot opendir /var/run/screen/S-user: Permission denied

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  • Sendmail Tuning For Batch Mail Jobs

    - by Kyle Brandt
    I have a webservers that send out emails to a sendmail relay server as a batch job. The emails need to be accepted by the relay sendmail server as fast as possible, however, they do not need to go out (be relayed) very quickly. I am seeing a couple timeouts once and a while from the webserver trying to connect to the relay server. The load currently is about 30 emails a second for a couple minutes. There are quite a few tuning options for sendmail in the sendmail tuning guide. What I am focusing on now is the Delivery Mode: Delivery Mode There are a number of delivery modes that sendmail can operate in, set by the DeliveryMode ( d) configuration option. These modes specify how quickly mail will be delivered. Legal modes are: i deliver interactively (synchronously) b deliver in background (asynchronously) q queue only (don't deliver) d defer delivery attempts (don't deliver) There are tradeoffs. Mode i gives the sender the quickest feedback, but may slow down some mailers and is hardly ever necessary. Mode b delivers promptly but can cause large numbers of processes if you have a mailer that takes a long time to deliver a message. Mode q minimizes the load on your machine, but means that delivery may be delayed for up to the queue interval. Mode d is identical to mode q except that it also prevents lookups in maps including the -D flag from working during the initial queue phase; it is intended for ``dial on demand'' sites where DNS lookups might cost real money. Some simple error messages (e.g., host unknown during the SMTP protocol) will be delayed using this mode. Mode b is the usual default. If you run in mode q (queue only), d (defer), or b (deliver in background) sendmail will not expand aliases and follow .forward files upon initial receipt of the mail. This speeds up the response to RCPT commands. Mode i should not be used by the SMTP server. I currently have the CentOS default modes: Sendmail.cf: DeliveryMode=background Submit.cf: DeliveryMode=i Is sendmail.cf/mc for outgoing email from relay (to the intertubes) and sumbit.cf/mc for incoming eamil (from my webservers). Would it make sense to change the outgoing delivery mode to queue? If I did, what would the outbound email flow behave like? If this is the right thing to do, can anyone show me example mc configurations for this change? If it isn't, what recommendations are there for these constraints?

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  • winbind failing after a semi-random amount of time

    - by The Digital Ninja
    I have winbind set up to authenticate to our AD for samba shares. This is the third such server, and the only one having any issues. It seems after a random amount of time samba shares will just stop working. Winbind processes seem to be running but restarting them seems to fix the issue for a while. Looking at the logs have been kind of hit an miss and I don't know exactly when it fails. One interesting thing is that it seems to be pulling from another domain controller that it shoudlnt. I censored out the domain name in this example. But isnt there some way to block authentication to a domain? I'm not sure if this is a symptom or a cause of the issue. [2010/10/18 08:02:10, 0] winbindd/winbindd_cache.c:initialize_winbindd_cache(2577) initialize_winbindd_cache: clearing cache and re-creating with version number 1 [2010/10/18 09:15:54, 1] libsmb/clikrb5.c:ads_krb5_mk_req(686) ads_krb5_mk_req: krb5_get_credentials failed for [email protected] (Cannot find KDC for requested realm) [2010/10/18 09:15:54, 1] libsmb/cliconnect.c:cli_session_setup_kerberos(624) cli_session_setup_kerberos: spnego_gen_negTokenTarg failed: Cannot find KDC for requested realm [2010/10/18 09:15:54, 0] lib/util_sock.c:write_data(1139) write_data: write failure. Error = Connection reset by peer [2010/10/18 09:15:54, 0] libsmb/clientgen.c:write_socket(242) write_socket: Error writing 108 bytes to socket 18: ERRNO = Connection reset by peer [2010/10/18 09:15:54, 0] libsmb/clientgen.c:cli_send_smb(290) Error writing 108 bytes to client. -1 (Connection reset by peer)

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  • Cygwin unable to compile

    - by christine
    I just downloaded Cygwin, I've never used it before cause I've always used putty. Cygwin is not letting me compile; I can see the files but it just doesn't let me compile and I do not understand why, am I doing something wrong? This is what's going on: Christine@Christine-PC ~ $ ls 8.6.c a.b.c a.c.c core new 2.txt test.c 9.13.c a.c a.out days.c new2.c test.txt Christine@Christine-PC ~ $ gcc a.c.c -bash: gcc: command not found

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  • Using the link command to keep backups on another drive

    - by Xavier
    I have a folder that contains a not so large amount of space called /data/backup. I have been told that if I link that folder (/data/backup) to an even bigger folder area like /bigdata/backup for example, that I will be able to execute backups to the /data/backup folder. It will then just create a link, but the data will be seen in both folders and the latter one (/bigdata/backup) will contain the backup results but it will show on both folders. Since the /bigdata/backup has far more disk space then the backup will no longer fail because of space problems in the /data/backup one. Is this true?

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  • Where is the hostname in /etc/hostname on a debian server used?

    - by Tchalvak
    I have a webserver running a number of websites. When I ssh in, it gives me a tab name of [email protected], which is counterintuitive, making it seem like those tabs are on my localhost. I would like to change the hostname, but I want to be sure that it won't break anything else. So for what purposes does that hostname string get used, and how can I be sure that it won't affect any functioning systems?

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  • How to fill in the network line in the ubuntu interfaces config file?

    - by matnagel
    I have to configure an ubuntu hardy server network interface. The service hoster told me that this is the network data for the machine: IP Range: 111.111.200.74 to 111.111.200.78 Netmask: 255.255.255.248 Broadcast: 111.111.200.79 Gateway: 111.111.200.73 Subnet: 111.111.200.72/29 I am only using the first IP address. I will update the /etc/hosts file with 111.111.200.74, but I am still unsure how the /etc/network/interfaces file should be. This is my plan: auto lo iface lo inet loopback auto eth0 iface eth0 inet static address 111.111.200.74 netmask 255.255.255.248 network 111.111.200.??? broadcast 111.111.200.79 gateway 111.111.200.73 As you can see I don't know how to build the network line. How would I calculate the data for the network line and what is the result? (I changed the first 2 octets of the subnet, they are not "111.111" in the real setup.)

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  • SELinux adding new allowed samba type to access httpd_sys_content_t?

    - by Josh
    allow samba_share_t httpd_sys_content_t {read execute getattr setattr write}; allow smbd_t httpd_sys_content_t {read execute getattr setattr write}; I am taking a stab in the dark with resources I've looked at, at various places that the above policies are what I want. I basically want to allow Samba to write to my web docs without giving it free access to the operating system. I read a post by a NSA rep saying the best way was defining a new type and allowing both samba and httpd access. Setting the content to public content (public_content_rw_t) does not work without making use of some unrestrictive booleans. To state this in short, how do I allow samba to access a new type?

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  • Is iptable capable of this or should I go with mod_proxy?

    - by Jesper
    I'm trying to configure my network to receive an incoming connection on one device and then redirect it to another device on a specific port. Right now I'm on about port 80 and a device running apache. The problem I'm facing is that when the forwarding is done it also sets the source ip to the first device instead of the source ip the user that connects to the service has. Let me illustrate it: [Internet User] = 7.7.7.7 connects to [Device 1] = 1.1.1.1:80 [Device 1] forwards it to [Device 2] = 1.1.1.2:80 [Device 2] outputs response that [Internet User] sees So on [Device 2] I will naturally see [Device 1]s IP in the logs, but I wanna see if there is a way to connect the internet user through [Device 1] to [Device 2] while seeing the real source IP in the logs on [Device 2]. Is that possible? My rule-set looks like this at the moment: (on Device 1) iptables -P FORWARD ACCEPT iptables -t nat -I PREROUTING -j DNAT -p tcp --dport 80 --to-destination 1.1.1.2:80 iptables -t nat -I POSTROUTING -j SNAT -p tcp -d 1.1.1.2 --to-source 1.1.1.1 On [Device 2] it accepts all incoming on port 80 from [Device 1] as well as accepts all related and established connections. So, would there be any way to get the real source onto [Device 2]? Let me know if you need more information!

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  • Start multiple instances of Firefox

    - by Vi
    How can I have multiple independent instances of Mozilla Firefox 3.5 on the same X server, but started from different user accounts (consequently, different profiles)? Limited success was only with Xephyr :1, DISPLAY=:1 /usr/local/bin/firefox, but Xephyr has no Cygwin/X's "rootless" mode so it's not comfortable (see other question). The idea is to have one Firefox instance for various "Serious Business" things and the other for regular browsing with dozens of add-ons securely isolated.

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  • Multiple interfaces to one IP address?

    - by Delan Azabani
    At present, I have: a Netgear router with DHCP off at 192.168.0.1 my computer eth0 at 192.168.0.2 wlan0 at 192.168.0.2 The wlan0 interface always connects to the router, while the eth0 interface connects to other computers with crossover and acts as a dnsmasq DHCP server for network boot and installation. If I use the Gnome NetworkManager to enable both connections, that is, with wlan0 connected to the router/internet and eth0 to another computer, both as 192.168.0.2, I cannot access the internet while eth0 is connected. Why is this? How can I configure my computer to follow wlan0 for Internet usage, but use eth0 for itself (the latter is working but blocking wlan0).

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  • SSH Advanced Logging

    - by Radek Šimko
    I've installed OpenSUSE on my server and want to set ssh to log every command, which is send to system over it. I've found this in my sshd_config: # Logging # obsoletes QuietMode and FascistLogging #SyslogFacility AUTH #LogLevel INFO I guess that both of those directives has to be uncommented, but I'd like to log every command, not only authorization (login/logout via SSH). I just want to know, if someone breaks into my system, what did he do.

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  • Hybrid gmail MX + postfix for local accounts

    - by krunk
    Here's the setup: We have a domain, mydomain.com. Everything is on our own server, except general email accounts which are through gmail. Currently gmail is set as the MX record. The server also has various email aliases it needs to support for bug trackers and such. e.g. [email protected] |/path/to/issuetracker.script I'm struggling with a setup that allows the following, both locally and from user's email clients. guser1 - has a gmail account and a local account guser2 - only has a gmail account bugs - has a pipe alias in /etc/aliases for issue tracker Scenarios mail to [email protected] from local host (crons and such) needs to go to gmail account mail to [email protected] from local host mail to [email protected] needs to be piped to the local issue tracker script So, the first stab was creating a transport map. In this scenario, the our server would be set as teh MX and guser* destined emails are sent to gmail. Put the gmail users in a map like so: [email protected] smtp:gmailsmtp:25 [email protected] smtp:gmailsmtp:25 Problems: Ignores extensions such as [email protected] Only works if append_at_myorigin = no (if set to yes, gmail refuses to connect with: E4C7E3E09BA3: to=, relay=none, delay=0.05, delays=0.02/0.01/0.02/0, dsn=4.4.1, status=deferred (connect to gmail-smtp-in.l.google.com[209.85.222.57]:25: Connection refused)) since append_at_myorigin is set to no, all received emails have (unknown sender) The second stab was to set explicit localhost aliases in /etc/aliases and do a domain wide forward on mydomain. This too requires setting the local server as the MX: root: root@localhost # transport mydomain.com smtp:gmailsmtp:25 Problems: * If I create a transport map for a domain that matches "$myhostname", the aliases file is never parsed. So when a local user (or daemon) sends an email like: mail -s "testing" root < text.txt Postfix ignores the /etc/alias entry and maps to [email protected] and attempts to send it to the gmail transport mapping. Third stab: Create a subdomain for the bugs, something like bugs.mydomain.com. Set the MX for this domain to local server and leave the MX for mydomain.com to the Gmail server. Problems: * Does not solve the issue with local accounts. So when the bug tracker responds to an email from [email protected], it uses a local transport and the user never receives the email. % postconf -n alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases append_at_myorigin = no append_dot_mydomain = no biff = no config_directory = /etc/postfix inet_interfaces = all mailbox_command = procmail -a "$EXTENSION" mailbox_size_limit = 0 mydestination = $myhostname, localhost.$myhostname, localhost myhostname = mydomain.com mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 myorigin = /etc/mailname readme_directory = no recipient_delimiter = + relayhost = smtp_tls_cert_file = /etc/ssl/certs/kspace.pem smtp_tls_enforce_peername = no smtp_tls_key_file = /etc/ssl/certs/kspace.pem smtp_tls_note_starttls_offer = yes smtp_tls_scert_verifydepth = 5 smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache smtp_use_tls = yes smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU) smtpd_recipient_restrictions = permit_mynetworks, reject_invalid_hostname, reject_non_fqdn_sender, reject_non_fqdn_recipient, reject_unknown_sender_domain, reject_unknown_recipient_domain, reject_unauth_destination smtpd_tls_ask_ccert = yes smtpd_tls_req_ccert = no smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache tls_random_source = dev:/dev/urandom transport_maps = hash:/etc/postfix/transport

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  • Nginx Forward SSL for single site

    - by Will.brown
    I have a nginx server setup and it works fine for http however i would like to bypass the proxy for https connection. I want it so that when someone goes to my ip https:// ip1 (Nginx server) it bypasses ngix and forwards all traffic to https:// ip2(webserver) i do not need ngix to do this for any ssl website just one particular website. SO Client to https:// ip1 to https:/ /ip2 to https:// ip1 to client pc I just want the nginx to not intercept the connection and forward it on and on return forward the connection to client Im guessing i do this by nat mascarade buy not exactly sure how to do it and if i will need to tell nginx to ignore ssl aswell can someone help me please this has gone me stuck

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  • "make menuconfig" throwing cannot find -lc error in my Fedora 11 PC

    - by Sen
    When i try to do a make menuconfig in a Fedora 11 machine it is throwing the following error message: [root@PC04 kernel]# make menuconfig HOSTCC -static scripts/basic/fixdep scripts/basic/fixdep.c: In function âtrapsâ: scripts/basic/fixdep.c:377: warning: dereferencing type-punned pointer will break strict-aliasing rules scripts/basic/fixdep.c:379: warning: dereferencing type-punned pointer will break strict-aliasing rules /usr/bin/ld: cannot find -lc collect2: ld returned 1 exit status make[1]: *** [scripts/basic/fixdep] Error 1 make: *** [scripts_basic] Error 2 Please help me on this issue? How can i solve this? Thanks, Sen

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  • not able to register sip user on red5server, using red5phone

    - by sunil221
    I start the red5, and then i start red5phone i try to register sip user , details i provide are username = 999999 password = **** ip = asteriskserverip and i got --- Registering contact -- sip:[email protected]:5072 the right contact could be --- sip :99999@asteriskserverip this is the log: SipUserAgent - listen -> Init... Red5SIP register [SIPUser] register RegisterAgent: Registering contact <sip:[email protected]:5072> (it expires in 3600 secs) RegisterAgent: Registration failure: No response from server. [SIPUser] SIP Registration failure Timeout RegisterAgent: Failed Registration stop try. Red5SIP Client leaving app 1 Red5SIP Client closing client 35C1B495-E084-1651-0C40-559437CAC7E1 Release ports: sip port 5072 audio port 3002 Release port number:5072 Release port number:3002 [SIPUser] close1 [SIPUser] hangup [SIPUser] closeStreams RTMPUser stopStream [SIPUser] unregister RegisterAgent: Unregistering contact <sip:[email protected]:5072> SipUserAgent - hangup -> Init... SipUserAgent - closeMediaApplication -> Init... [SIPUser] provider.halt RegisterAgent: Registration failure: No response from server. [SIPUser] SIP Registration failure Timeout please let me know if i am doing anything wrong. regards Sunil

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  • Running Mathimatica-5 remotely

    - by oxinabox.ucc.asn.au
    Ok, I have Mathmatica 5 - a powerful CAS. I have a cheap netbook, wich not olny is too slow to run mathmatica on, I doubt it has the harddrive space. I do however have remote access to a number of very powerful computers, (most of wich run variose linuxes, but one of which is windows server 2008) Mostly over SSH but other protocols can be arraged for some, i'm sure. (I might even be able to remote desktop the windows server 2008) So I'ld like to install Mathmatica onto one of these machine and then run it remotely. Either from the command line via putty or via some other method. I glanced through the mathmatical documentaion and read soemthing about using some MathLink program, wich linkes the front end istalled on my computer to a remote kernal. Anyone have any expirience with this? I'm not sure if this belongs here or in SuperUser.

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  • Symbolic Links Between User Accounts

    - by Pez Cuckow
    I have been using a cron job to duplicate a folder into another users account every day and someone suggested using symbolic links instead although I cannot get them to work. In summary user GAMER generates log files that they want to access via HTTP, however I only have a web-server in the user account SERVER, in the past I would copy the logs folder from GAMERS account into SERVER/public_html/. and then chmod the files so the server could access them. Trying to use symbolic links I set up a link from root (as only root can access both accounts) I used: ln -s /home/GAMER/game/logs/ /home/SERVER/public_html/logs However it seems that only root can use this link, I tried chmoding the link, all the files in the gamers /game/logs/*, /game/logs itself to 777 as well as changing chown and chgrp to server the files still cannot be read. When viewed from servers account my shell shows the link and where it is to hi-lighted in black with red text. Am I doing something wrong? Please enlighten me! /home/GAMER/game/ (chmod & chgrp) drwxrwxrwx 3 SERVER SERVER 4096 2011-01-07 15:46 logs /home/SERVER/public_html (chmod -h & chgrp -h) lrwxrwxrwx 1 server server 41 2011-01-07 19:53 logs -> /home/GAMER/game/logs/

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  • Revo 3610 not doing hdmi handshake

    - by DoomStone
    I am having a problem with my Revo 3610 witch is connected to my tv via hdmi. For some reason will it not do the hdmi handshake with the tv, so my tv does not think that there are anything in the hdmi port. I have tested the tv and it works find, with my laptop and dvd. It dose work some times, but this time have it failed for 2 days in a row, and i have tried rebooting, turning the tv off and on, and so on nothing helps. I can trick the TV to listen to the HDMI with connecting with my laptop and then change the hdmi back to my revo, this on the other hand results in the image going thoug nicely but there are a big fat "Check signal cable." on the screen. I have also tryed changing the resolution in the revo but this dose not help ether. Have any one had this problem before, and if so how did you fix it? Example: http://i.imgur.com/gguZ4.jpg

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  • Is it possible to either abort or interrupt and later continue a lvconvert -m1 operation?

    - by SLi
    I have run the command lvconvert -m1 rootvg/newroot /dev/sdb to convert a linear logical volume to a mirrored one. The operation has not yet finished; I interrupted the command with ctrl-c at around 10% mark, but the operation seems to be running in the background anyway. Is it possible to either 1) Abort the lvconvert operation and revert to the state before it? (This would be my preferred option) 2) To safely interrupt the operation and resume it later?

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  • Constantly diminishing free space on fedora 17

    - by Varun Madiath
    I don't know how to explain this other than to say that my computer seems to magically run out of free when it runs for a while. The output of df -h . oh my home direction is below /dev/mapper/vg_vmadiath--dev-lv_home 50G 47G 0 100% /home When I run sudo du -cks * | sort -rn | head -11 on /home I get the following output. I got this from decreasing free space on fedora 12 32744344 total 32744328 vmadiath 16 lost+found If I restart my system things seem to fix themselves and I'm left with about 20 or 25GB of free space. I'm running XFCE with XMonad as my window manager under fedora 17. Programs I'm running include the XFCE terminal, grep, find, firefox, eclipse, libre-office writer, zsh, emacs. Any help will be greatly appreciated. I'll gladly give you any other output you might need.

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  • Upgrade to ubuntu 13.04 from 12.04 with iso image

    - by Digvijay Yadav
    I have ubuntu 12.04 installed on my system. I want to upgrade it to ubuntu 13.04. I want to do this upgrade using an iso image of ubuntu 13.04. I tried this Solution But it didn't work for me. After running these command I didn't get any alerts about updating. Also I don't understand the gksu part of the solution. Here are the steps I tried: sudo mount -t iso9660 -o loop PATH/TO/ISO /cdrom then sudo /cdrom/cdromupgrade Read more: http://linuxpoison.blogspot.tw/2011/06/how-to-upgrade-ubuntu-using-alternate.html#ixzz2SFMqlOPx I also wanted to know, If I can do this using a networked computer. By this I mean the iso file is on some other computer. Thank you.

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  • How to prioritize openvpn traffic?

    - by aditsu
    I have an openvpn server, with one network interface. VPN traffic is extremely slow. I tried to do traffic control with this configuration (currently): qdisc del dev eth0 root qdisc add dev eth0 root handle 1: htb default 12 class add dev eth0 parent 1: classid 1:1 htb rate 900mbit #vpn class add dev eth0 parent 1:1 classid 1:10 htb rate 1500kbit ceil 3000kbit prio 1 #local net class add dev eth0 parent 1:1 classid 1:11 htb rate 10mbit ceil 900mbit prio 2 #other class add dev eth0 parent 1:1 classid 1:12 htb rate 500kbit ceil 1000kbit prio 2 filter add dev eth0 protocol ip parent 1:0 prio 1 u32 match ip sport 1194 0xffff flowid 1:10 filter add dev eth0 protocol ip parent 1:0 prio 2 u32 match ip dst 192.168.10.0/24 flowid 1:11 qdisc add dev eth0 parent 1:10 handle 10: sfq perturb 10 qdisc add dev eth0 parent 1:11 handle 11: sfq perturb 10 qdisc add dev eth0 parent 1:12 handle 12: sfq perturb 10 But it's still extremely slow. I have an imaps connection that keeps transferring data continuously (I successfully limited the rate) but with openvpn I can't seem to get more than about 100kbit/s The internet connection speed is about 3mbit/s (symmetric) What could be the problem? Does the sport filter work for udp?

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