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34758 discussions

iptables
by alexus 20 Sep '10

20 Sep '10

I'm trying to do some simple tcp port forwarding [root@wcmisdlin02 ~]# cat /proc/sys/net/ipv4/ip_forward 0 [root@wcmisdlin02 ~]# /bin/echo 1 > /proc/sys/net/ipv4/ip_forward [root@wcmisdlin02 ~]# cat /proc/sys/net/ipv4/ip_forward 1 [root@wcmisdlin02 ~]# iptables --list Chain INPUT (policy ACCEPT) target prot opt source destination RH-Firewall-1-INPUT all -- anywhere anywhere Chain FORWARD (policy ACCEPT) target prot opt source destination RH-Firewall-1-INPUT all -- anywhere anywhere Chain OUTPUT (policy ACCEPT) target prot opt source destination Chain RH-Firewall-1-INPUT (2 references) target prot opt source destination ACCEPT all -- anywhere anywhere ACCEPT icmp -- anywhere anywhere icmp any ACCEPT esp -- anywhere anywhere ACCEPT ah -- anywhere anywhere ACCEPT udp -- anywhere 224.0.0.251 udp dpt:mdns ACCEPT udp -- anywhere anywhere udp dpt:ipp ACCEPT tcp -- anywhere anywhere tcp dpt:ipp ACCEPT all -- anywhere anywhere state RELATED,ESTABLISHED ACCEPT tcp -- anywhere anywhere state NEW tcp dpt:mysql ACCEPT tcp -- anywhere anywhere state NEW tcp dpt:ssh ACCEPT tcp -- anywhere anywhere state NEW tcp dpt:http ACCEPT tcp -- anywhere anywhere state NEW tcp dpt:ftp ACCEPT tcp -- anywhere anywhere state NEW tcp dpt:https REJECT all -- anywhere anywhere reject-with icmp-host-prohibited [root@wcmisdlin02 ~]# iptables --table nat --append PREROUTING --proto tcp --dport 80 --jump DNAT --to 10.52.208.223:80 [root@wcmisdlin02 ~]# iptables --table nat --list PREROUTING Chain PREROUTING (policy ACCEPT) target prot opt source destination DNAT tcp -- anywhere anywhere tcp dpt:http to:10.52.208.223:80 [root@wcmisdlin02 ~]# curl --verbose http://10.52.208.221:80 * About to connect() to 10.52.208.221 port 80 * Trying 10.52.208.221... Connection refused * couldn't connect to host * Closing connection #0 curl: (7) couldn't connect to host [root@wcmisdlin02 ~]# -- http://alexus.org/

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Gnome mouse configuration.
by James B. Byrne 20 Sep '10

20 Sep '10

On my Centos-5.5 (x64) based desktop the optical mouse I originally configured during the system install has died. In /etc/sysconfig/hwconf this is configured as: class: MOUSE bus: USB detached: 0 device: input/mice driver: genericwheelusb desc: "Microsoft Microsoft 3-Button Mouse with IntelliEye(TM)" usbclass: 3 usbsubclass: 1 usbprotocol: 2 usbbus: 4 usblevel: 1 usbport: 0 usbdev: 4 vendorId: 045e deviceId: 0053 usbmfr: Microsoft usbprod: Microsoft 3-Button Mouse with IntelliEye(TM) I have replaced the failed mouse with a spare from our surplus parts cabinet and now the centre wheel/button click no longer inserts selected text at the current cursor position. I would like to obtain this feature with the replacement mouse, which is described on the bottom as a MicroSoft Optical Mouse Blue USB and PS/2 compatible. It has a usb connector which is plugged directly into the chassis usb port. All the other features of the mouse seem to work just fine. I simply cannot obtain the centre button click insert capability. Is there no way to simply force CentOS-5 to re-detect the attached mouse? It must have done something akin to this during the initial install. I tried running kudzu as root from a gnome terminal session but that had no effect that I can detect. -- *** E-Mail is NOT a SECURE channel *** James B. Byrne mailto:ByrneJB@Harte-Lyne.ca Harte & Lyne Limited http://www.harte-lyne.ca 9 Brockley Drive vox: +1 905 561 1241 Hamilton, Ontario fax: +1 905 561 0757 Canada L8E 3C3

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xen
by mattias 20 Sep '10

20 Sep '10

If i will use nat on a xen vm what should i set in the config file?

2 2

How to simulate minimal ISO install using stage2 image file?
by Chad Woolley 20 Sep '10

20 Sep '10

Hello, I'm working on a project which automates creation of EC2 AMI images. To do this, you must use a running EC2 instance to mount an image file in a chroot jail. My problem is that I want to create an AMI that looks exactly like a minimal (nothing selected) install from the CentOS ISO image, but the "stage2" image [1] file is much more "minimal" than that. e.g., it doesn't have yum, groups, devices, networking, etc set up as you would if you had run the ISO minimal install on a real or virtual box. I can't mount the ISO directly in the chroot (as far as I know, but I could be wrong). My question is, how can I make the mounted stage2.img chroot jail look just like a minimal ISO install? I could manually create everything (which I have started), but this is a lot of work, and I'm likely to miss something that an ISO build would have (e.g. some group). Is there some other standard CentOS script I can run after mounting the stage2.img which will do everything the installer does? Can I run the installer manually with some kickstart script? Pointers to references and documentation are welcome... Thanks, -- Chad [1] http://mirrors.usc.edu/pub/linux/distributions/centos/5.5/os/x86_64/images/

1 1

Using Make in frequent cron job
by Kenneth Porter 20 Sep '10

20 Sep '10

Is there a way to get Make to be silent when it does nothing, but have its normal verbosity when something is made? I want to use Make in a frequent cron job (every 1/2 hour, perhaps 10 minutes) but I don't want to get a bunch of emails telling me nothing was done (which will be most of the time). I just want to know when it found something to do.

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Re: [CentOS] Using Make in frequent cron job
by Chad Woolley 20 Sep '10

20 Sep '10

On Sun, Sep 19, 2010 at 6:58 PM, Kenneth Porter <shiva(a)sewingwitch.com> wrote: > Is there a way to get Make to be silent when it does nothing, but have its > normal verbosity when something is made? You can write a wrapper script and run it in a subshell to capture the output. Pretend echo is make: a=$(echo 'made something') # no output if echo $a | grep 'made something' > /dev/null; then echo $a fi HTH, -- Chad

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GRUB woes: GRUB Hard Disk Error
by Rob Del Vecchio 19 Sep '10

19 Sep '10

Hello all, I am attempting to install CentOS 5.5 on a recently donated home server (was Windows). I've tried installing twice; first, separating /boot, swap, /, /var, /usr and /home into different partitions, the second time choosing default layout. Both times have resulted in "GRUB Hard Disk Error" upon boot. About the hard disk, it is a Seagate SATA drive. I do not have another drive to configure RAID. The BIOS is set to: Onboard PATA/SATA Adapters = Both SATA mode = IDE Onboard PATA/SATA Cofiguration = Enhanced Mode (???) Upon booting into rescue mode, the file systems mount successfully and I am able to read data from files. The current file structure is (default layout): /boot / swap grub.conf: #boot=/dev/sda1 default=0 timeout=5 splashimage=(hd1,0)/grub/splash.xpm.gz hiddenmenu title CentOS (2.6.18-194.el5) root (hd1,0) kernel /vmlinuz-2.6.18-194.el5 ro root=/dev/VolGroup00/LogVol00 initrd /initrd-2.6.18-194.el5.img title Other rootmoverify (hd0,0) chainloader +1 This is brand new from the installation. My questions are, what am I missing? Bad configuration? Should boot=/dev/sda1 really be commented out? Some pointers for manually installing and configuring grub would be great, as I am lacking experience in that area. Any idea as to what is going on would be great! Thanks in advance, Rob

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Issue with HP Officejet 6500 on CentOS 5.5
by Mark 19 Sep '10

19 Sep '10

I just picked one of these up to replace my 4315, which broke (I think the feeder roller gear broke from an overstuffed feeder), but it's giving me problems. I had no trouble configuring it to print, but it doesn't appear in lsusb and xsane can't find it, so I can't scan with it, which is the main reason I bought it in the first place. I've tried restarting the autofs service (automounter), rebooting, and switching the USB cables with my old HP Scanjet 3300C, but the 3300 shows up on either cable and the 6500 doesn't appear at all. I checked in Google and saw other issues with the 6500, but this wasn't one of them. Any suggestions? I suppose I could get a switch and hook it up via Ethernet, but that really isn't a good solution, and it doesn't explain the problem. Thanks. Mark

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NX and CentOS 5.5?
by Raymond Jender 19 Sep '10

19 Sep '10

I am pulling my hair out here folks...... I am running CentOS 5.5 in command line only. Reason being I am standing up an IDS system on it. I have installed the NX client/node and server pkgs. I have installed the NX client for windows on a Vista box. When I attemtp to connect from the Vista to CentOS, I get this: NX> 203 NXSSH running with pid: 22080 NX> 285 Enabling check on switch command NX> 285 Enabling skip of SSH config files NX> 285 Setting the preferred NX options NX> 200 Connected to address: 192.168.1.70 on port: 22 NX> 202 Authenticating user: nx NX> 208 Using auth method: publickey NX> 204 Authentication failed. Now I have been googling and re-googling. Plenty of people have had the same issue, but I have yet to find a solution that works for me. Funny that most of the stuff I'm finding on google is 4-5 years old! I'm sure I am probably missing something so simple I will puke! I think I read that someone did an install and it worked right out of the box!! Incredible! I'd really like to see a CentOS - NX configuration guide but couldn't find one. Can someone just tell me how this should be configured....what changes do I need to make and to what config files? ssh (putty and WinSCP) works just fine for me in case you need to know. If you need any particular information, please let me know. Thanks. Ray

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should vsftpd be disabled in favour of sftp for security reasons?
by Robert P. J. Day 18 Sep '10

18 Sep '10

(another in an ongoing list of things i just want to clarify for the sake of future courses taught on centos.) from this RHEL doc page: http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html/Deploymen… the reader is advised to, for the sake of security, remove/disable vsftpd, ostensibly in favour of sftp/sftp-server. really? i can obviously see disallowing stuff like telnet and rsh and rlogin, that's a no-brainer. but advising against vsftpd for the sake of security? i'm not sure i see the logic in that. thoughts? rday -- ======================================================================== Robert P. J. Day Waterloo, Ontario, CANADA Top-notch, inexpensive online Linux/OSS/kernel courses http://crashcourse.ca Twitter: http://twitter.com/rpjday LinkedIn: http://ca.linkedin.com/in/rpjday ========================================================================

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