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Hengjie's questions

Martin Hope
Hengjie
Asked: 2012-04-16 05:19:14 +0800 CST
  • 5

I'm currently using Heroku (which uses AWS) and my program needs to communicate with my own EC2 instance. I've made my EC2 instance in the same Region as Herokus', however, in order to reduce costs further I want to be able to community via the private IP address between my Heroku dyno and EC2 instance in the same Availability Zone.

I know I can restart Heroku to switch between servers and potentially different availability zones, however, is there any way to determine if they're in the same availability zone or in a different availability zone?

Potentially I can write a program that will restart Heroku to the point that it is in the same zone.

amazon-ec2 amazon-web-services heroku availability
Martin Hope
Hengjie
Asked: 2012-04-12 09:14:58 +0800 CST
  • 1

I have a problem where running ntpdate on my server doesn't return any data therefore I get the following error:

[root@server etc]# ntpdate -d -u -v time.nist.gov 
12 Apr 01:10:09 ntpdate[32072]: ntpdate [email protected] Fri Nov 18 13:21:21 UTC 2011 (1)
Looking for host time.nist.gov and service ntp
host found : 24-56-178-141.co.warpdriveonline.com
transmit(24.56.178.141)
transmit(24.56.178.141)
transmit(24.56.178.141)
transmit(24.56.178.141)
transmit(24.56.178.141)
24.56.178.141: Server dropped: no data
server 24.56.178.141, port 123
stratum 0, precision 0, leap 00, trust 000
refid [24.56.178.141], delay 0.00000, dispersion 64.00000
transmitted 4, in filter 4
reference time:    00000000.00000000  Thu, Feb  7 2036 14:28:16.000
originate timestamp: 00000000.00000000  Thu, Feb  7 2036 14:28:16.000
transmit timestamp:  d3303975.1311947c  Thu, Apr 12 2012  1:10:13.074
filter delay:  0.00000  0.00000  0.00000  0.00000 
         0.00000  0.00000  0.00000  0.00000 
filter offset: 0.000000 0.000000 0.000000 0.000000
         0.000000 0.000000 0.000000 0.000000
delay 0.00000, dispersion 64.00000
offset 0.000000

12 Apr 01:10:14 ntpdate[32072]: no server suitable for synchronization found

I have tried Googling the 'no server suitable for synchronization found' error online and I have tried disabling my firewall (running iptables -L returns no rules). I have also confirmed with my DC that there are no rules that are blocking ntp (port 123).

Does anyone have any ideas on how I may fix this?

Btw, this is what the output should look like on a working server in another DC:

11 Apr 19:01:24 ntpdate[725]: ntpdate [email protected] Fri Nov 18 13:21:17 UTC 2011 (1)
Looking for host 184.105.192.247 and service ntp
host found : 247.conarusp.net
transmit(184.105.192.247)
receive(184.105.192.247)
transmit(184.105.192.247)
receive(184.105.192.247)
transmit(184.105.192.247)
receive(184.105.192.247)
transmit(184.105.192.247)
receive(184.105.192.247)
transmit(184.105.192.247)
receive(184.105.192.247)
transmit(184.105.192.247)
server 184.105.192.247, port 123
stratum 2, precision -20, leap 00, trust 000
refid [184.105.192.247], delay 0.18044, dispersion 0.00006
transmitted 4, in filter 5
reference time:    d330364e.e956694f  Wed, Apr 11 2012 18:56:46.911
originate timestamp: d3303765.8702d025  Wed, Apr 11 2012 19:01:25.527
transmit timestamp:  d3303765.73b213e3  Wed, Apr 11 2012 19:01:25.451
filter delay:  0.18069  0.18044  0.18045  0.18048 
         0.18048  0.00000  0.00000  0.00000 
filter offset: -0.00195 -0.00197 -0.00211 -0.00202
         -0.00202 0.000000 0.000000 0.000000
delay 0.18044, dispersion 0.00006
offset -0.001970
centos time ntp ntpdate
Martin Hope
Hengjie
Asked: 2012-04-10 20:06:49 +0800 CST
  • 0

Whenever, I try and run yum update I get the following error:

[root@server ~]# yum update
Loaded plugins: dellsysid, fastestmirror
Loading mirror speeds from cached hostfile
 * base: mirror01.idc.hinet.net
 * extras: mirror01.idc.hinet.net
 * rpmforge: fr2.rpmfind.net
 * updates: mirror01.idc.hinet.net
Excluding Packages in global exclude list
Finished
Setting up Update Process
Resolving Dependencies
--> Running transaction check
---> Package NetworkManager.x86_64 1:0.7.0-13.el5 set to be updated
---> Package NetworkManager-glib.x86_64 1:0.7.0-13.el5 set to be updated
---> Package SysVinit.x86_64 0:2.86-17.el5 set to be updated
---> Package acl.x86_64 0:2.2.39-8.el5 set to be updated
---> Package acpid.x86_64 0:1.0.4-12.el5 set to be updated
---> Package apr.x86_64 0:1.2.7-11.el5_6.5 set to be updated
---> Package aspell.x86_64 12:0.60.3-12 set to be updated
---> Package audit.x86_64 0:1.8-2.el5 set to be updated
---> Package audit-libs.x86_64 0:1.8-2.el5 set to be updated
---> Package audit-libs-python.x86_64 0:1.8-2.el5 set to be updated
---> Package authconfig.x86_64 0:5.3.21-7.el5 set to be updated
---> Package autofs.x86_64 1:5.0.1-0.rc2.163.el5 set to be updated
---> Package bash.x86_64 0:3.2-32.el5 set to be updated
---> Package bind.x86_64 30:9.3.6-20.P1.el5 set to be updated
---> Package bind-libs.x86_64 30:9.3.6-20.P1.el5 set to be updated
---> Package bind-utils.x86_64 30:9.3.6-20.P1.el5 set to be updated
---> Package binutils.x86_64 0:2.17.50.0.6-20.el5 set to be updated
---> Package centos-release.x86_64 10:5-8.el5.centos set to be updated
---> Package centos-release-notes.x86_64 0:5.8-0 set to be updated
---> Package coreutils.x86_64 0:5.97-34.el5_8.1 set to be updated
---> Package cpp.x86_64 0:4.1.2-52.el5 set to be updated
---> Package cpuspeed.x86_64 1:1.2.1-10.el5 set to be updated
---> Package crash.x86_64 0:5.1.8-1.el5.centos set to be updated
---> Package cryptsetup-luks.x86_64 0:1.0.3-8.el5 set to be updated
---> Package cups.x86_64 1:1.3.7-30.el5 set to be updated
---> Package cups-libs.x86_64 1:1.3.7-30.el5 set to be updated
---> Package curl.x86_64 0:7.15.5-15.el5 set to be updated
--> Processing Dependency: dbus = 1.1.2-15.el5_6 for package: dbus-libs
---> Package dbus.x86_64 0:1.1.2-16.el5_7 set to be updated
---> Package dbus-libs.x86_64 0:1.1.2-16.el5_7 set to be updated
---> Package device-mapper.x86_64 0:1.02.67-2.el5 set to be updated
---> Package device-mapper-event.x86_64 0:1.02.67-2.el5 set to be updated
---> Package device-mapper-multipath.x86_64 0:0.4.7-48.el5_8.1 set to be updated
---> Package dhclient.x86_64 12:3.0.5-31.el5 set to be updated
---> Package dmidecode.x86_64 1:2.11-1.el5 set to be updated
---> Package dmraid.x86_64 0:1.0.0.rc13-65.el5 set to be updated
---> Package dmraid-events.x86_64 0:1.0.0.rc13-65.el5 set to be updated
---> Package dump.x86_64 0:0.4b41-6.el5 set to be updated
---> Package e2fsprogs.x86_64 0:1.39-33.el5 set to be updated
---> Package e2fsprogs-devel.x86_64 0:1.39-33.el5 set to be updated
---> Package e2fsprogs-libs.x86_64 0:1.39-33.el5 set to be updated
---> Package ecryptfs-utils.x86_64 0:75-8.el5 set to be updated
---> Package file.x86_64 0:4.17-21 set to be updated
---> Package finger.x86_64 0:0.17-33 set to be updated
---> Package firstboot-tui.x86_64 0:1.4.27.9-1.el5.centos set to be updated
---> Package freetype.x86_64 0:2.2.1-28.el5_7.2 set to be updated
---> Package freetype-devel.x86_64 0:2.2.1-28.el5_7.2 set to be updated
---> Package ftp.x86_64 0:0.17-37.el5 set to be updated
---> Package gamin.x86_64 0:0.1.7-10.el5 set to be updated
---> Package gamin-python.x86_64 0:0.1.7-10.el5 set to be updated
---> Package gawk.x86_64 0:3.1.5-15.el5 set to be updated
---> Package gcc.x86_64 0:4.1.2-52.el5 set to be updated
---> Package gcc-c++.x86_64 0:4.1.2-52.el5 set to be updated
---> Package glibc.i686 0:2.5-81.el5_8.1 set to be updated
---> Package glibc.x86_64 0:2.5-81.el5_8.1 set to be updated
---> Package glibc-common.x86_64 0:2.5-81.el5_8.1 set to be updated
---> Package glibc-devel.x86_64 0:2.5-81.el5_8.1 set to be updated
---> Package glibc-headers.x86_64 0:2.5-81.el5_8.1 set to be updated
---> Package gnutls.x86_64 0:1.4.1-7.el5_8.2 set to be updated
---> Package groff.x86_64 0:1.18.1.1-13.el5 set to be updated
---> Package gtk2.x86_64 0:2.10.4-21.el5_7.7 set to be updated
---> Package gzip.x86_64 0:1.3.5-13.el5.centos set to be updated
---> Package hmaccalc.x86_64 0:0.9.6-4.el5 set to be updated
---> Package htop.x86_64 0:1.0.1-2.el5.rf set to be updated
---> Package hwdata.noarch 0:0.213.26-1.el5 set to be updated
---> Package ifd-egate.x86_64 0:0.05-17.el5 set to be updated
---> Package initscripts.x86_64 0:8.45.42-1.el5.centos set to be updated
---> Package iproute.x86_64 0:2.6.18-13.el5 set to be updated
---> Package iptables.x86_64 0:1.3.5-9.1.el5 set to be updated
---> Package iptables-ipv6.x86_64 0:1.3.5-9.1.el5 set to be updated
---> Package iscsi-initiator-utils.x86_64 0:6.2.0.872-13.el5 set to be updated
---> Package kernel.x86_64 0:2.6.18-308.1.1.el5 set to be installed
---> Package kernel-headers.x86_64 0:2.6.18-308.1.1.el5 set to be updated
---> Package kpartx.x86_64 0:0.4.7-48.el5_8.1 set to be updated
---> Package krb5-devel.x86_64 0:1.6.1-70.el5 set to be updated
---> Package krb5-libs.x86_64 0:1.6.1-70.el5 set to be updated
---> Package krb5-workstation.x86_64 0:1.6.1-70.el5 set to be updated
---> Package ksh.x86_64 0:20100621-5.el5_8.1 set to be updated
---> Package kudzu.x86_64 0:1.2.57.1.26-3.el5.centos set to be updated
---> Package less.x86_64 0:436-9.el5 set to be updated
---> Package lftp.x86_64 0:3.7.11-7.el5 set to be updated
---> Package libX11.x86_64 0:1.0.3-11.el5_7.1 set to be updated
---> Package libX11-devel.x86_64 0:1.0.3-11.el5_7.1 set to be updated
---> Package libXcursor.x86_64 0:1.1.7-1.2 set to be updated
---> Package libacl.x86_64 0:2.2.39-8.el5 set to be updated
---> Package libgcc.x86_64 0:4.1.2-52.el5 set to be updated
---> Package libgomp.x86_64 0:4.4.6-3.el5.1 set to be updated
---> Package libpng.x86_64 2:1.2.10-16.el5_8 set to be updated
---> Package libpng-devel.x86_64 2:1.2.10-16.el5_8 set to be updated
---> Package libsmbios.x86_64 0:2.2.27-3.2.el5 set to be updated
---> Package libstdc++.x86_64 0:4.1.2-52.el5 set to be updated
---> Package libstdc++-devel.x86_64 0:4.1.2-52.el5 set to be updated
---> Package libsysfs.x86_64 0:2.1.0-1.el5 set to be updated
---> Package libusb.x86_64 0:0.1.12-6.el5 set to be updated
---> Package libvolume_id.x86_64 0:095-14.27.el5_7.1 set to be updated
---> Package libxml2.x86_64 0:2.6.26-2.1.15.el5_8.2 set to be updated
---> Package libxml2-python.x86_64 0:2.6.26-2.1.15.el5_8.2 set to be updated
---> Package logrotate.x86_64 0:3.7.4-12 set to be updated
---> Package lsof.x86_64 0:4.78-6 set to be updated
---> Package lvm2.x86_64 0:2.02.88-7.el5 set to be updated
---> Package m2crypto.x86_64 0:0.16-8.el5 set to be updated
---> Package man.x86_64 0:1.6d-2.el5 set to be updated
---> Package man-pages.noarch 0:2.39-20.el5 set to be updated
---> Package mcelog.x86_64 1:0.9pre-1.32.el5 set to be updated
---> Package mesa-libGL.x86_64 0:6.5.1-7.10.el5 set to be updated
---> Package mesa-libGL-devel.x86_64 0:6.5.1-7.10.el5 set to be updated
---> Package microcode_ctl.x86_64 2:1.17-1.56.el5 set to be updated
---> Package mkinitrd.x86_64 0:5.1.19.6-75.el5 set to be updated
---> Package mktemp.x86_64 3:1.5-24.el5 set to be updated
--> Processing Dependency: nash = 5.1.19.6-68.el5_6.1 for package: mkinitrd
---> Package nash.x86_64 0:5.1.19.6-75.el5 set to be updated
---> Package net-snmp.x86_64 1:5.3.2.2-17.el5 set to be updated
---> Package net-snmp-devel.x86_64 1:5.3.2.2-17.el5 set to be updated
---> Package net-snmp-libs.x86_64 1:5.3.2.2-17.el5 set to be updated
---> Package net-snmp-utils.x86_64 1:5.3.2.2-17.el5 set to be updated
---> Package net-tools.x86_64 0:1.60-82.el5 set to be updated
---> Package nfs-utils.x86_64 1:1.0.9-60.el5 set to be updated
---> Package nfs-utils-lib.x86_64 0:1.0.8-7.9.el5 set to be updated
---> Package nscd.x86_64 0:2.5-81.el5_8.1 set to be updated
---> Package nspr.x86_64 0:4.8.9-1.el5_8 set to be updated
---> Package nspr-devel.x86_64 0:4.8.9-1.el5_8 set to be updated
---> Package nss.x86_64 0:3.13.1-5.el5_8 set to be updated
---> Package nss-devel.x86_64 0:3.13.1-5.el5_8 set to be updated
---> Package nss-tools.x86_64 0:3.13.1-5.el5_8 set to be updated
---> Package nss_ldap.x86_64 0:253-49.el5 set to be updated
---> Package ntp.x86_64 0:4.2.2p1-15.el5.centos.1 set to be updated
---> Package numactl.x86_64 0:0.9.8-12.el5_6 set to be updated
---> Package oddjob.x86_64 0:0.27-12.el5 set to be updated
---> Package oddjob-libs.x86_64 0:0.27-12.el5 set to be updated
---> Package openldap.x86_64 0:2.3.43-25.el5 set to be updated
---> Package openssh.x86_64 0:4.3p2-82.el5 set to be updated
---> Package openssh-clients.x86_64 0:4.3p2-82.el5 set to be updated
---> Package openssh-server.x86_64 0:4.3p2-82.el5 set to be updated
---> Package openssl.i686 0:0.9.8e-22.el5_8.1 set to be updated
---> Package openssl.x86_64 0:0.9.8e-22.el5_8.1 set to be updated
---> Package openssl-devel.x86_64 0:0.9.8e-22.el5_8.1 set to be updated
---> Package pam_krb5.x86_64 0:2.2.14-22.el5 set to be updated
---> Package pam_pkcs11.x86_64 0:0.5.3-26.el5 set to be updated
---> Package pango.x86_64 0:1.14.9-8.el5.centos.3 set to be updated
---> Package parted.x86_64 0:1.8.1-29.el5 set to be updated
---> Package pciutils.x86_64 0:3.1.7-5.el5 set to be updated
---> Package perl.x86_64 4:5.8.8-38.el5 set to be updated
---> Package perl-Compress-Raw-Bzip2.x86_64 0:2.037-1.el5.rf set to be updated
---> Package perl-Compress-Raw-Zlib.x86_64 0:2.037-1.el5.rf set to be updated
---> Package perl-rrdtool.x86_64 0:1.4.7-1.el5.rf set to be updated
---> Package poppler.x86_64 0:0.5.4-19.el5 set to be updated
---> Package poppler-utils.x86_64 0:0.5.4-19.el5 set to be updated
---> Package popt.x86_64 0:1.10.2.3-28.el5_8 set to be updated
---> Package postgresql-libs.x86_64 0:8.1.23-1.el5_7.3 set to be updated
---> Package procps.x86_64 0:3.2.7-18.el5 set to be updated
---> Package proftpd.x86_64 0:1.3.4a-1.el5.rf set to be updated
--> Processing Dependency: perl(Mail::Sendmail) for package: proftpd
---> Package python.x86_64 0:2.4.3-46.el5 set to be updated
---> Package python-ctypes.x86_64 0:1.0.2-3.el5 set to be updated
---> Package python-libs.x86_64 0:2.4.3-46.el5 set to be updated
---> Package python-smbios.x86_64 0:2.2.27-3.2.el5 set to be updated
---> Package rhpl.x86_64 0:0.194.1-2 set to be updated
---> Package rmt.x86_64 0:0.4b41-6.el5 set to be updated
---> Package rng-utils.x86_64 1:2.0-5.el5 set to be updated
---> Package rpm.x86_64 0:4.4.2.3-28.el5_8 set to be updated
---> Package rpm-build.x86_64 0:4.4.2.3-28.el5_8 set to be updated
---> Package rpm-devel.x86_64 0:4.4.2.3-28.el5_8 set to be updated
---> Package rpm-libs.x86_64 0:4.4.2.3-28.el5_8 set to be updated
---> Package rpm-python.x86_64 0:4.4.2.3-28.el5_8 set to be updated
---> Package rrdtool.x86_64 0:1.4.7-1.el5.rf set to be updated
---> Package rsh.x86_64 0:0.17-40.el5_7.1 set to be updated
---> Package rsync.x86_64 0:3.0.6-4.el5_7.1 set to be updated
---> Package ruby.x86_64 0:1.8.5-24.el5 set to be updated
---> Package ruby-libs.x86_64 0:1.8.5-24.el5 set to be updated
---> Package sblim-sfcb.x86_64 0:1.3.11-49.el5 set to be updated
---> Package sblim-sfcc.x86_64 0:2.2.2-49.el5 set to be updated
---> Package selinux-policy.noarch 0:2.4.6-327.el5 set to be updated
---> Package selinux-policy-targeted.noarch 0:2.4.6-327.el5 set to be updated
---> Package setup.noarch 0:2.5.58-9.el5 set to be updated
---> Package shadow-utils.x86_64 2:4.0.17-20.el5 set to be updated
---> Package smartmontools.x86_64 1:5.38-3.el5 set to be updated
---> Package smbios-utils-bin.x86_64 0:2.2.27-3.2.el5 set to be updated
---> Package smbios-utils-python.x86_64 0:2.2.27-3.2.el5 set to be updated
---> Package sos.noarch 0:1.7-9.62.el5 set to be updated
---> Package srvadmin-omilcore.x86_64 0:6.5.0-1.452.1.el5 set to be updated
---> Package strace.x86_64 0:4.5.18-11.el5_8 set to be updated
---> Package subversion.x86_64 0:1.6.11-7.el5_6.4 set to be updated
---> Package sudo.x86_64 0:1.7.2p1-13.el5 set to be updated
---> Package sysfsutils.x86_64 0:2.1.0-1.el5 set to be updated
---> Package syslinux.x86_64 0:3.11-7 set to be updated
---> Package system-config-network-tui.noarch 0:1.3.99.21-1.el5 set to be updated
---> Package talk.x86_64 0:0.17-31.el5 set to be updated
---> Package tar.x86_64 2:1.15.1-31.el5 set to be updated
---> Package traceroute.x86_64 3:2.0.1-6.el5 set to be updated
---> Package tzdata.x86_64 0:2012b-3.el5 set to be updated
---> Package udev.x86_64 0:095-14.27.el5_7.1 set to be updated
---> Package util-linux.x86_64 0:2.13-0.59.el5 set to be updated
---> Package vixie-cron.x86_64 4:4.1-81.el5 set to be updated
---> Package wget.x86_64 0:1.11.4-3.el5_8.1 set to be updated
---> Package xinetd.x86_64 2:2.3.14-16.el5 set to be updated
---> Package yp-tools.x86_64 0:2.9-2.el5 set to be updated
---> Package ypbind.x86_64 3:1.19-12.el5_6.1 set to be updated
---> Package yum.noarch 0:3.2.22-39.el5.centos set to be updated
---> Package yum-dellsysid.x86_64 0:2.2.27-3.2.el5 set to be updated
---> Package yum-fastestmirror.noarch 0:1.1.16-21.el5.centos set to be updated
---> Package zlib.x86_64 0:1.2.3-4.el5 set to be updated
---> Package zlib-devel.x86_64 0:1.2.3-4.el5 set to be updated
--> Running transaction check
--> Processing Dependency: dbus = 1.1.2-15.el5_6 for package: dbus-libs
--> Processing Dependency: nash = 5.1.19.6-68.el5_6.1 for package: mkinitrd
---> Package perl-Mail-Sendmail.noarch 0:0.79-1.2.el5.rf set to be updated
base/filelists                                                                                                                                                                        | 3.5 MB     00:00     
dell-omsa-indep/filelists                                                                                                                                                             | 195 kB     00:01     
dell-omsa-specific/filelists                                                                                                                                                          | 1.0 kB     00:00     
extras/filelists_db                                                                                                                                                                   | 224 kB     00:00     
rpmforge/filelists                                                                                                                                                                    | 4.8 MB     00:06     
updates/filelists_db                                                                                                                                                                  | 715 kB     00:00     
--> Finished Dependency Resolution
dbus-libs-1.1.2-15.el5_6.i386 from installed has depsolving problems
  --> Missing Dependency: dbus = 1.1.2-15.el5_6 is needed by package dbus-libs-1.1.2-15.el5_6.i386 (installed)
mkinitrd-5.1.19.6-68.el5_6.1.i386 from installed has depsolving problems
  --> Missing Dependency: nash = 5.1.19.6-68.el5_6.1 is needed by package mkinitrd-5.1.19.6-68.el5_6.1.i386 (installed)
Error: Missing Dependency: nash = 5.1.19.6-68.el5_6.1 is needed by package mkinitrd-5.1.19.6-68.el5_6.1.i386 (installed)
Error: Missing Dependency: dbus = 1.1.2-15.el5_6 is needed by package dbus-libs-1.1.2-15.el5_6.i386 (installed)
 You could try using --skip-broken to work around the problem
 You could try running: package-cleanup --problems
                        package-cleanup --dupes
                        rpm -Va --nofiles --nodigest
The program package-cleanup is found in the yum-utils package.

I have tried running package-cleanup --dupes and package-cleanup --problems but to no avail.

centos yum update dbus