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  • What kind of issues would occur if resolve.conf had no dns servers set?

    - by Stuart Woodward
    I want to create a server for a customer and have that customer finish the configuration for themselves. It was been decided that rather than setting default DNS servers (i.e. something like Google's) that the customer should enter the information by themselves. I assume that the customer is technically competent enough to do this. If however they forget or neglect to set this up they might spend some time trying to figure out what is wrong and eventually contact support. (In this case, I think that setting a default might have been better.) Apart from the obvious inability to resolve hosts, what other issues might they face until they have set valid dns servers in resolve.conf?

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  • Barnyard Service - MySQL Error

    - by SLYN
    I installed barnyard2 and saved as a service. When I run service barnyard2 start, Barnyard2 is failed. After I run tail -100 /var/log/messages and I encounter a fault like this. ERROR database: 'mysql' support is not compiled into this build of snort#012 Aug 22 11:52:06 barnyard2[25771]: FATAL ERROR: If this build of barnyard2 was obtained as a binary distribution (e.g., rpm,#012or Windows), then check for alternate builds that contains the necessary#012'mysql' support.#012#012If this build of barnyard2 was compiled by you, then re-run the#012the ./configure script using the '--with-mysql' switch.#012For non-standard installations of a database, the '--with-mysql=DIR'#012syntax may need to be used to specify the base directory of the DB install.#012#012See the database documentation for cursory details (doc/README.database).#012and the URL to the most recent database plugin documentation. Aug 22 11:52:06 barnyard2[25771]: Barnyard2 exiting What sould I do for solving this problem? When I installed Barnyard2, I used these commands: # ./configure --with-mysql --with-mysql-libraries=/usr/lib64/mysql # make ; make install (My System is CentOS 6.5 x86_64.)

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  • How to know that my IP is invalid

    - by PeterMmm
    I have a script running that will start up an interface with a new IP. If the script comes up with an IP that is already in use i am in trouble. Is it possible that the script set up the new Ip, detects that this IP is already in use and then check the next one, until it finds an ip that works ? B=192.168.1. I=1 while [ "$I" != "256" ] do ifconfig eth0:1 $B.$I # check here that IP is Ok ! let "I=I+1" done

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  • Are PHP session files ever deleted?

    - by GetFree
    I see there are thousands of files in my "/tmp" directory (a CentOS machine) and almost all of them are PHP session files. I'm worried about the possible impact this might have on my system. Are those files ever deleted either by the OS, Apache or PHP? or I have to take care of it myself?

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  • scsi and ata entries for same hard drive under /dev/disk/by-id

    - by John Dibling
    I am trying to set up a ZFS pool using 4 bare drives which I have attached to my Ubuntu system via a SATA hot swap backplane. These are Hitachi SATA drives. When I list the contents of /dev/disk/by-id, I see two entries for each drive: root@scorpius:/dev/disk/by-id# ls | grep Hitachi ata-Hitachi_HDS5C3030ALA630_MJ1323YNG0ZJ7C ata-Hitachi_HDS5C3030ALA630_MJ1323YNG1064C ata-Hitachi_HDS5C3030ALA630_MJ1323YNG190AC ata-Hitachi_HDS5C3030ALA630_MJ1323YNG1DGPC scsi-SATA_Hitachi_HDS5C30_MJ1323YNG0ZJ7C scsi-SATA_Hitachi_HDS5C30_MJ1323YNG1064C scsi-SATA_Hitachi_HDS5C30_MJ1323YNG190AC scsi-SATA_Hitachi_HDS5C30_MJ1323YNG1DGPC I know these are the same drives because I wrote down the serial numbers, and all the other drives in this system are either Seagate or WD. The serial number for the first one, for example, is YNG0ZJ7C. Why are there two entries here for each drive? More to the point, when I create my ZFS pool which one should I use; the scsi- one or the ata- one?

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  • Raid 5 GPT Partitioning

    - by user39325
    I have a Dell Poweredge r710 server with five 1 TB disks. All of them are in RAID 5. I was trying to install Centos but it says "Your boot partition is on disk using GPT Partition..." I read somewhere that centos can't install on a disk larger than 2TB, so I made some partitions smaller, but it's not working. PS, I am going to install Proxmox on that, but Proxmox also won't accept disks larger than 2TB.

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  • What music streaming app fits my needs on Ubuntu?

    - by Jim
    I'm looking for an application to stream Internet radio on Ubuntu. I like listening to Radio Paradise while I work. Right now, I'm using Amarok. "Movie Player" sometimes refuses to open the stream, and VLC doesn't keep its window title updated with the currently playing track. Amarok has nice translucent notifications when tracks change, but track changes in streams don't trigger the notifications. Mostly, I want something that reliably opens streams and makes it easy to see the name of the track that's playing. If it has a built-in directory of streaming radio stations, that would be a big benefit.

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  • How to set the laptop screen brightness programatically?

    - by zls
    I'm currently migrating to openbox without gnome session. In unity i can use the vendor keys to set the screen brightness, but in openbox I'm on my own. /sys/class/backlight/acpi_video0/brightness works fine, the problem is that I need sudo to set the brightness and that wouldn't work with keyboard mappings. xbacklight -get/set doesn't do or output anything. I don't really want to use xrandr --brightness. Are there any other options or a way to fix the problems with xbacklight or acpi_video0 ?

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  • Using screen to monitor non-interactive scripts (or some other solution)

    - by Michael
    I have some autonomous scripts that run commands on remote machines over ssh. These scripts rely on getting stdout, stderr, and the return code of each command run. I want to be able to monitor the progress of the scripts on each target machine so that I can see if something has hung and possibly intervene if necessary. My initial idea was to have the scripts run commands in a screen session, so that the person monitoring could simply attach to the session with screen -x. However, it was hard to do that from a script since screen is an interactive program. I can send a command to the screen session with screen -S session -X stuff "command^M", but then I don't get the output and return code that I need back. My second idea was to put script /path/to/log in ~/.bash_profile and log the entire session to a file. Then the monitoring person could simply tail the log file. However, this doesn't provide the interactivity that I was looking for. Any ideas on how to solve this problem?

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  • Rpm removal does not remove delivered dirs and leaves garbage

    - by Jim
    I deliver an application via an RPM. This application delivers various directories and files. E.g. under /opt/internal/com a file structure is being copied. I was expecting that on rpm -e all the file structure delivered under /opt/internal/com will be removed. But it does not. There are directories in the file structure that are non-empty. Is this the reason? But these (non-empty) directories were created by the RPM installation. So I would expect that they would be "owned" by RPM and removed automatically. Is this wrong? Am I supposed to remove them manually?

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  • Ubuntu 64-bit vs 32-bit

    - by tukushan
    Is it worth installing the Ubuntu 9.10 64-bit version over the 32-bit x86 version? I will get the ability to address more than 4 GB of memory, but other than that, how does the 64-bit version fare in terms of performance and stability?

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  • How to read iptables -L output?

    - by skrebbel
    I'm rather new to iptables, and I'm trying to understand its output. I tried to RTFM, but to no avail when it comes to little details like these. When iptables -vnL gives me a line such as: Chain INPUT (policy DROP 2199 packets, 304K bytes) I understand the first part: on incoming data, if the list below this line does not provide any exceptions, then the default policy is to DROP incoming packets. But what does the 2199 packets, 304K bytes part mean? Is that all the packets that were dropped? Is there any way to find out which packets that were, and where they came from? Thanks!

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  • CentOS 6 init script doesn't work properly

    - by user711643
    I'm setting up my ruby production server based on CentOS 6. I need a process called god (which is a process monitoring tool) to start at boot. I'm using an init script that I found here. Just as stated in the guide I ran: chkconfig --add god and then chkconfig --level 345 god on After this if I run "service god start|restart" everything works. It loads the available configurations and brings up the related processes (if they are not running). Problem is it doesn't work at boot. If I reboot the system, then I do "ps -aux | grep god". At this point "god" is running but apparently it didn't load the configuration files. If i run again service god restart, it loads everything without problems. What am I doing wrong?

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  • Find hosted directories/ports in Jetty/Apache

    - by Paul Creasey
    Hi, I first asked this on SO, but i didn't get a response and i think it is probably more appropriate here. Let say I have a directory which is being hosted by Jetty or Apache (i'd like an answer for both), i know the URL including the port and i can log into the server. How can i find the directory that is being hosted by a certain port? I'd also like to go the other way, i have a folder on the server, which i know if being hosted, but i don't know the port so i can't find it in a web browser. How can i find a list of directories that are being hosted? This has been bugging me for ages but i've never bothered to ask before! Thanks.

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  • Why do we see multiple PID's related to same application/owner for http like this below. What does this mean?

    - by Muthukumar Alagappan
    Why do we see multiple PID's related to same application/owner for http like this below. What does this mean?. $ ps -ef | grep httpd | grep -v grep apache 9619 20181 0 07:08 ? 00:00:03 /usr/sbin/httpd apache 10092 20181 0 Jan24 ? 00:00:07 /usr/sbin/httpd apache 13086 20181 0 06:09 ? 00:00:00 /usr/sbin/httpd apache 13717 20181 0 Jan25 ? 00:00:01 /usr/sbin/httpd apache 14730 20181 0 07:13 ? 00:00:01 /usr/sbin/httpd apache 16359 20181 0 09:54 ? 00:00:00 /usr/sbin/httpd root 20181 1 0 2011 ? 00:00:01 /usr/sbin/httpd apache 21450 20181 0 09:55 ? 00:00:00 /usr/sbin/httpd

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  • What Logs / Process Stats to monitor on a Ubuntu FTP server?

    - by Adam Salkin
    I am administering a server with Ubuntu Server which is running pureFTP. So far all is well, but I would like to know what I should be monitoring so that I can spot any potential stability and security issues. I'm not looking for sophisticated software, more an idea of what logs and process statistics are most useful for checking on the health of the system. I'm thinking that I can look at various parameters output from the "ps" command and compare to see if I have things like memory leaks. But I would like to know what experienced admins do. Also, how do I do a disk check so that when I reboot, I don't get a message saying something like "disk not checked for x days, forcing check" which delays the reboot? I assume there is command that I can run as a cron job late at night. How often should it be run? What things should I be looking at to spot intrusion attempts? The only shell access is SSH on a non-standard port through UFW firewall, and I regularly do a grep on auth.log for "Fail" or "Invalid". Is there anything else I should look at? I was logging the firewall (UFW) but I have very few open ports (FTP and SSH on a non standard port) so looking at lists of IP's that have been blocked did not seem useful. Many thanks

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  • blocking port 80 via iptables

    - by JoyIan Yee-Hernandez
    I'm having problems with iptables. I am trying to block port 80 from the outside, basically plan is we just need to Tunnel via SSH then we can get on the GUI etc. on a server I have this in my rule: Chain OUTPUT (policy ACCEPT 28145 packets, 14M bytes) pkts bytes target prot opt in out source destination 0 0 DROP tcp -- * eth1 0.0.0.0/0 0.0.0.0/0 tcp dpt:80 state NEW,ESTABLISHED And Chain INPUT (policy DROP 41 packets, 6041 bytes) 0 0 DROP tcp -- eth1 * 0.0.0.0/0 0.0.0.0/0 tcp dpt:80 state NEW,ESTABLISHED Any guys wanna share some insights?

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  • Allow SFTP in iptables

    - by Kevin Orriss
    I have just purchased a VPS from linode and am going through the setup guide. I have everything running (apache2, php, mysql etc) but I am being denied access via SFTP when using fileZilla to upload a file. Now this is my second time installing the server as I missed a section out the first time. I was able to connect to my server through SFTP on filezilla the first time and the thing I missed out was adding a new user and editing the iptables in the firewall. So it would seem that the guide I have been following has blocked SFTP but allowed SSH. Here is the iptables file: *filter # Allow all loopback (lo0) traffic and drop all traffic to 127/8 that doesn't use lo0 -A INPUT -i lo -j ACCEPT -A INPUT ! -i lo -d 127.0.0.0/8 -j REJECT # Accept all established inbound connections -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT # Allow all outbound traffic - you can modify this to only allow certain traffic -A OUTPUT -j ACCEPT # Allow HTTP and HTTPS connections from anywhere (the normal ports for websites and SSL). -A INPUT -p tcp --dport 80 -j ACCEPT -A INPUT -p tcp --dport 443 -j ACCEPT # Allow SSH connections # # The -dport number should be the same port number you set in sshd_config # -A INPUT -p tcp -m state --state NEW --dport 22 -j ACCEPT # Allow ping -A INPUT -p icmp -m icmp --icmp-type 8 -j ACCEPT # Log iptables denied calls -A INPUT -m limit --limit 5/min -j LOG --log-prefix "iptables denied: " --log-level 7 # Reject all other inbound - default deny unless explicitly allowed policy -A INPUT -j REJECT -A FORWARD -j REJECT COMMIT All I would like is a line I need to put in there which allows SFTP over port 22. Thank you for reading this.

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  • Execute script before shutting down in Ubuntu

    - by juanefren
    When I shut down my computer I want to show some pending tasks that I have to do before leaving the office... I did a local application to manage those tasks, so basically I just want to run a command, and shut down after I kill the app executed. I have already tried with these options: * /etc/gdm/PostSession/Default -- this works only when I select LogOut option instead Shutdown. * /etc/rc0.d/K01mycustomscript -- execute script after X is killed * $HOME/.bash_logout -- This looks like does nothing. * ./app-to-run && sudo shutdown -h now -- Don't like it for 2 reasons, prompts for sudo password, and can't use my laptop shutdown button. I am using Ubuntu 10.04

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  • What is the meaning of the 'Personalities' feature under /proc/mdstat

    - by drcelus
    On some systems I see this : Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4] [multipath] [faulty] md1 : active raid1 sdb1[1] sda1[0] 10485696 blocks [2/2] [UU] md2 : active raid1 sdb2[1] sda2[0] 477371328 blocks [2/2] [UU] And other systems show : Personalities : [raid1] md0 : active raid1 sdb2[1] sda2[0] 204788 blocks super 1.0 [2/2] [UU] md1 : active raid1 sdb1[1] sda1[0] 4193272 blocks super 1.1 [2/2] [UU] md2 : active raid1 sda3[0] sdb3[1] 483985276 blocks super 1.1 [2/2] [UU] bitmap: 0/4 pages [0KB], 65536KB chunk I wonder what is the meaning of Personalities and the impact of having different values.

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  • How to Extending a logical volume in WMWare

    - by Mercer
    down vote favorite i have a CentOS 6.3 into my Virtual Machine. I have 2 Disk: Disk#1 = 18G Disk#2 = 20G [root@vm ~]# df -h Filesystem Filesystem Size Used Avail Use% Mounted on /dev/mapper/vg_system-lv_root 1008M 250M 708M 27% / tmpfs 1.9G 0 1.9G 0% /dev/shm /dev/sda1 194M 31M 154M 17% /boot /dev/mapper/vg_system-lv_home 504M 17M 462M 4% /home /dev/mapper/vg_system-lv_opt 2.0G 68M 1.9G 4% /opt /dev/mapper/vg_produits-lv_grid 6.9G 2.5G 4.1G 38% /opt/grid /dev/mapper/vg_produits-lv_oracle 6.9G 144M 6.4G 3% /opt/oracle /dev/mapper/vg_system-lv_tmp 2.8G 71M 2.6G 3% /tmp /dev/mapper/vg_system-lv_usr 2.5G 1.6G 799M 67% /usr /dev/mapper/vg_system-lv_var 2.0G 278M 1.6G 15% /var So i want to extend my /tmp and my /opt/oracle like this: 10Go in/tmp 13Go in /opt/oracle Thx.

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  • cannot find java even though it is there (ubuntu 12.04)

    - by Jeff Storey
    I'm trying to just execute the java command and it's saying it cannot be found, even though it is there. Here's what my output looks like root@oneiric:/usr/lib/jvm/default-java/bin# ls -al java -rwxrwxrwx 1 uucp 143 5750 2012-09-20 11:14 java root@oneiric:/usr/lib/jvm/default-java/bin# ./java -su: ./java: No such file or directory So the ls shows it's there, but it doesn't seem to execute. Can someone explain why this is?

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  • Upgrade CentOS 5.2 to 5.3 -- but not 5.4

    - by Jeff Leyser
    Server currently running CentOS 5.2. Developers tell me they'd like the machine upgrade to CentOS 5.3 -- but not all the way to CentOS 5.4, as they haven't tested with 5.4 yet. I'm pretty sure a yum upgrade will put me at 5.4, as a yum check-update shows all sorts of 5.4 packages. So how do I move up to 5.3?

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  • IPTables configuration help

    - by Sam
    I'm after some help with setting up IPTables. Mostly the configuration is working, but regardless of what I try I cannot allow localhost to access the local Apache only (i.e. localhost to access localhost:80 only). Here is my script: !/bin/bash Allow root to access external web and ftp iptables -t filter -A OUTPUT -p tcp --dport 21 --match owner --uid-owner 0 -j ACCEPT iptables -t filter -A OUTPUT -p tcp --dport 80 --match owner --uid-owner 0 -j ACCEPT Allow DNS queries iptables -A OUTPUT -p udp --dport 53 -j ACCEPT iptables -A OUTPUT -p tcp --dport 53 -j ACCEPT Allow in and outbound SSH to/from any server iptables -A INPUT -p tcp -s 0/0 --dport 22 -j ACCEPT iptables -A OUTPUT -p tcp -d 0/0 --sport 22 -j ACCEPT Accept ICMP requests iptables -A INPUT -p icmp -s 0/0 -j ACCEPT iptables -A OUTPUT -p icmp -d 0/0 -j ACCEPT Accept connections from any local machines but disallow localhost access to networked machines iptables -A INPUT -s 10.0.1.0/24 -j ACCEPT iptables -A OUTPUT -d 10.0.1.0/24 -j DROP Drop ALL other traffic iptables -A OUTPUT -p tcp -d 0/0 -j DROP iptables -A OUTPUT -p udp -d 0/0 -j DROP Now I have tried many permutations and I'm obviously missing everything. I place them above the in/out bound SSH to/from, so it's not the precedence order. If someone could give me the heads up on allowing only the local machine to access the local web server, that'd be great. Cheers guys.

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