Having trouble shutting down ActiveMQ? - Connection refused to host: localhost; nested exception

# service activemq stop
INFO: Loading '/etc/sysconfig/activemq'
INFO: Using java 'java'
INFO: changing to user 'activemq' to invoke java
INFO: Waiting at least 30 seconds for regular process termination of pid '32766' :
Java Runtime: Oracle Corporation 1.7.0_75 /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.75.x86_64/jre
  Heap sizes: current=503296k  free=498011k  max=503296k
    JVM args: -Xms512m -Xmx512m -Djava.util.logging.config.file=logging.properties -Dhawtio.realm=activemq -Dhawtio.role=admins -Dhawtio.rolePrincipalClasses=org.apache.activemq.jaas.GroupPrincipal -Djava.security.auth.login.config=/etc/activemq/login.config -Dactivemq.classpath=/etc/activemq; -Dactivemq.home=/usr/share/activemq -Dactivemq.base=/usr/share/activemq -Dactivemq.conf=/etc/activemq -Dactivemq.data=/usr/share/activemq/data
Extensions classpath:
  [/usr/share/activemq/lib,/usr/share/activemq/lib/camel,/usr/share/activemq/lib/optional,/usr/share/activemq/lib/web,/usr/share/activemq/lib/extra]
ACTIVEMQ_HOME: /usr/share/activemq
ACTIVEMQ_BASE: /usr/share/activemq
ACTIVEMQ_CONF: /etc/activemq
ACTIVEMQ_DATA: /usr/share/activemq/data
Connecting to pid: 32766
INFO: failed to resolve jmxUrl for pid:32766, using default JMX url
Connecting to JMX URL: service:jmx:rmi:///jndi/rmi://localhost:1099/jmxrmi
ERROR: java.lang.RuntimeException: Failed to execute stop task. Reason: java.io.IOException: Failed to retrieve RMIServer stub: javax.naming.ServiceUnavailableException [Root exception is java.rmi.ConnectException: Connection refused to host: localhost; nested exception is:
        java.net.ConnectException: Connection refused]
java.lang.RuntimeException: Failed to execute stop task. Reason: java.io.IOException: Failed to retrieve RMIServer stub: javax.naming.ServiceUnavailableException [Root exception is java.rmi.ConnectException: Connection refused to host: localhost; nested exception is:
        java.net.ConnectException: Connection refused]
        at org.apache.activemq.console.command.ShutdownCommand.runTask(ShutdownCommand.java:116)
        at org.apache.activemq.console.command.AbstractCommand.execute(AbstractCommand.java:57)
        at org.apache.activemq.console.command.AbstractJmxCommand.execute(AbstractJmxCommand.java:387)
        at org.apache.activemq.console.command.ShellCommand.runTask(ShellCommand.java:150)
        at org.apache.activemq.console.command.AbstractCommand.execute(AbstractCommand.java:57)
        at org.apache.activemq.console.command.ShellCommand.main(ShellCommand.java:104)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at org.apache.activemq.console.Main.runTaskClass(Main.java:262)
        at org.apache.activemq.console.Main.main(Main.java:115)
ERROR: java.lang.Exception: java.io.IOException: Failed to retrieve RMIServer stub: javax.naming.ServiceUnavailableException [Root exception is java.rmi.ConnectException: Connection refused to host: localhost; nested exception is:
        java.net.ConnectException: Connection refused]
java.lang.Exception: java.io.IOException: Failed to retrieve RMIServer stub: javax.naming.ServiceUnavailableException [Root exception is java.rmi.ConnectException: Connection refused to host: localhost; nested exception is:
        java.net.ConnectException: Connection refused]
        at org.apache.activemq.console.command.ShutdownCommand.runTask(ShutdownCommand.java:117)
        at org.apache.activemq.console.command.AbstractCommand.execute(AbstractCommand.java:57)
        at org.apache.activemq.console.command.AbstractJmxCommand.execute(AbstractJmxCommand.java:387)
        at org.apache.activemq.console.command.ShellCommand.runTask(ShellCommand.java:150)
        at org.apache.activemq.console.command.AbstractCommand.execute(AbstractCommand.java:57)
        at org.apache.activemq.console.command.ShellCommand.main(ShellCommand.java:104)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at org.apache.activemq.console.Main.runTaskClass(Main.java:262)
        at org.apache.activemq.console.Main.main(Main.java:115)
Caused by: java.io.IOException: Failed to retrieve RMIServer stub: javax.naming.ServiceUnavailableException [Root exception is java.rmi.ConnectException: Connection refused to host: localhost; nested exception is:
        java.net.ConnectException: Connection refused]
        at javax.management.remote.rmi.RMIConnector.connect(RMIConnector.java:369)
        at javax.management.remote.JMXConnectorFactory.connect(JMXConnectorFactory.java:268)
        at javax.management.remote.JMXConnectorFactory.connect(JMXConnectorFactory.java:227)
        at org.apache.activemq.console.command.AbstractJmxCommand.createJmxConnector(AbstractJmxCommand.java:279)
        at org.apache.activemq.console.command.AbstractJmxCommand.createJmxConnection(AbstractJmxCommand.java:302)
        at org.apache.activemq.console.command.ShutdownCommand.runTask(ShutdownCommand.java:81)
        ... 11 more
Caused by: javax.naming.ServiceUnavailableException [Root exception is java.rmi.ConnectException: Connection refused to host: localhost; nested exception is:
        java.net.ConnectException: Connection refused]
        at com.sun.jndi.rmi.registry.RegistryContext.lookup(RegistryContext.java:118)
        at com.sun.jndi.toolkit.url.GenericURLContext.lookup(GenericURLContext.java:203)
        at javax.naming.InitialContext.lookup(InitialContext.java:411)
        at javax.management.remote.rmi.RMIConnector.findRMIServerJNDI(RMIConnector.java:1929)
        at javax.management.remote.rmi.RMIConnector.findRMIServer(RMIConnector.java:1896)
        at javax.management.remote.rmi.RMIConnector.connect(RMIConnector.java:286)
        ... 16 more
Caused by: java.rmi.ConnectException: Connection refused to host: localhost; nested exception is:
        java.net.ConnectException: Connection refused
        at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:619)
        at sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:216)
        at sun.rmi.transport.tcp.TCPChannel.newConnection(TCPChannel.java:202)
        at sun.rmi.server.UnicastRef.newCall(UnicastRef.java:341)
        at sun.rmi.registry.RegistryImpl_Stub.lookup(Unknown Source)
        at com.sun.jndi.rmi.registry.RegistryContext.lookup(RegistryContext.java:114)
        ... 21 more
Caused by: java.net.ConnectException: Connection refused
        at java.net.PlainSocketImpl.socketConnect(Native Method)
        at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)
        at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)
        at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)
        at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
        at java.net.Socket.connect(Socket.java:579)
        at java.net.Socket.connect(Socket.java:528)
        at java.net.Socket.(Socket.java:425)
        at java.net.Socket.(Socket.java:208)
        at sun.rmi.transport.proxy.RMIDirectSocketFactory.createSocket(RMIDirectSocketFactory.java:40)
        at sun.rmi.transport.proxy.RMIMasterSocketFactory.createSocket(RMIMasterSocketFactory.java:147)
        at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:613)
        ... 26 more
.............................
INFO: Regular shutdown not successful,  sending SIGKILL to process with pid '32766'

Edit the activemq.xml file and change the following createConnector="false" to true:

Cannot get latest version of phpMyAdmin to work - mb_detect_encoding gettext error

Do you get a blank page with the latest version of phpMyAdmin? Looking in the logs you see:

[Tue Feb 03 11:47:35 2015] [error] [client 137.222.17.70] PHP Fatal error:  Call
 to undefined function mb_detect_encoding() in libraries/php-gettext/gettext.inc on line 177

Install php-mbstring:

# yum install php-mbstring

Clear Puppet Client Certificate - for signing by another server

root@puppetclient:~# puppet agent --test
Warning: Unable to fetch my node definition, but the agent run will continue:
Warning: SSL_connect returned=1 errno=0 state=SSLv3 read server certificate B: certificate verify failed: [self signed certificate in certificate chain for /CN=Puppet CA: puppetmaster.domain.net]
Info: Retrieving pluginfacts
Error: /File[/var/lib/puppet/facts.d]: Failed to generate additional resources using 'eval_generate': SSL_connect returned=1 errno=0 state=SSLv3 read server certificate B: certificate verify failed: [self signed certificate in certificate chain for /CN=Puppet CA: puppetmaster.domain.net]
Error: /File[/var/lib/puppet/facts.d]: Could not evaluate: Could not retrieve file metadata for puppet://puppet/pluginfacts: SSL_connect returned=1 errno=0 state=SSLv3 read server certificate B: certificate verify failed: [self signed certificate in certificate chain for /CN=Puppet CA: puppetmaster.domain.net]
Wrapped exception:
SSL_connect returned=1 errno=0 state=SSLv3 read server certificate B: certificate verify failed: [self signed certificate in certificate chain for /CN=Puppet CA: puppetmaster.domain.net]
Info: Retrieving plugin
Error: /File[/var/lib/puppet/lib]: Failed to generate additional resources using 'eval_generate': SSL_connect returned=1 errno=0 state=SSLv3 read server certificate B: certificate verify failed: [self signed certificate in certificate chain for /CN=Puppet CA: puppetmaster.domain.net]
Error: /File[/var/lib/puppet/lib]: Could not evaluate: Could not retrieve file metadata for puppet://puppet/plugins: SSL_connect returned=1 errno=0 state=SSLv3 read server certificate B: certificate verify failed: [self signed certificate in certificate chain for /CN=Puppet CA: puppetmaster.domain.net]
Wrapped exception:
SSL_connect returned=1 errno=0 state=SSLv3 read server certificate B: certificate verify failed: [self signed certificate in certificate chain for /CN=Puppet CA: puppetmaster.domain.net]
Error: Could not retrieve catalog from remote server: SSL_connect returned=1 errno=0 state=SSLv3 read server certificate B: certificate verify failed: [self signed certificate in certificate chain for /CN=Puppet CA: puppetmaster.domain.net]
Warning: Not using cache on failed catalog
Error: Could not retrieve catalog; skipping run
Error: Could not send report: SSL_connect returned=1 errno=0 state=SSLv3 read server certificate B: certificate verify failed: [self signed certificate in certificate chain for /CN=Puppet CA: puppetmaster.domain.net]

root@puppetclient:~# cd /etc/puppet/

environments  manifests  modules  ssl  templates
root@puppetclient:/etc/puppet# mv ssl /var/tmp

root@puppetclient:/etc/puppet# puppet cert list -a
Notice: Signed certificate request for ca

root@puppetclient:/etc/puppet# puppet agent --test
Info: Creating a new SSL key for puppetclient.domain.net
Info: Caching certificate for ca
Info: csr_attributes file loading from /etc/puppet/csr_attributes.yaml
Info: Creating a new SSL certificate request for puppetclient.domain.net
Info: Certificate Request fingerprint (SHA256): A4:3D:23:2F:9C:76:FD:BE:D3:3F:D4:CE:9B:CA:88:00:4F:C3:07:4A:2D:FB:A1:A1:61:21:E1:10:03:07:6C:C3
Info: Caching certificate for puppetclient.domain.net
Info: Caching certificate_revocation_list for ca
Info: Caching certificate for ca
Warning: Unable to fetch my node definition, but the agent run will continue:
Warning: Error 400 on SERVER: Failed to find puppetclient.domain.net via exec: Execution of '/etc/puppet/node.rb puppetclient.domain.net' returned 1:
Info: Retrieving pluginfacts
Info: Retrieving plugin
Notice: /File[/var/lib/puppet/lib/puppet]/ensure: created
Notice: /File[/var/lib/puppet/lib/puppet/provider]/ensure: created
Notice: /File[/var/lib/puppet/lib/puppet/provider/augeasprovider]/ensure: created
Notice: /File[/var/lib/puppet/lib/puppet/provider/ini_subsetting]/ensure: created
Notice: /File[/var/lib/puppet/lib/puppet/provider/augeasprovider/default.rb]/ensure: defined content as '{md5}b5377fd9cd6f96b0bd08e7213c7fc363'
Notice: /File[/var/lib/puppet/lib/puppet/provider/file_line]/ensure: created
Notice: /File[/var/lib/puppet/lib/puppet/util]/ensure: created
Notice: /File[/var/lib/puppet/lib/puppet/util/ipcidr.rb]/ensure: defined content as '{md5}e1160dfd6e73fc5ef2bb8abc291f6fd5'

[snip]

Notice: /File[/var/lib/puppet/lib/puppet/parser/functions/parsejson.rb]/ensure: defined content as '{md5}e7f968c34928107b84cd0860daf50ab1'
Notice: /File[/var/lib/puppet/lib/puppet/parser/functions/validate_cmd.rb]/ensure: defined content as '{md5}78fd21cb3fc52efc3b53ba2b3301de18'
Notice: /File[/var/lib/puppet/lib/puppet/parser/functions/nslookup.rb]/ensure: defined content as '{md5}976cfe36eec535d97a17139c7408f0bd'
Info: Loading facts
Info: Caching catalog for puppetclient.domain.net
Info: Applying configuration version '1422885145'
Info: Creating state file /var/lib/puppet/state/state.yaml
Notice: Finished catalog run in 0.10 seconds

Can't start a VM with Ganeti - Debian 7

So you just installed a Debian 7 Wheezy Ganeti managed Xen cluster node and it won't start up your VM with this error:

# gnt-instance start goat.cs
Waiting for job 1277134 for vminstance ...
Job 1277134 for goat.cs has failed: Failure: command execution error:
Could not start instance: Hypervisor error: Failed to start instance goat.cs: exited with exit code 1 (Using config file "/etc/xen/goat.cs".
Error: Device 0 (vif) could not be connected. /etc/xen/scripts/vif-bridge failed; error detected.
)

If look in the log file xen-hotplug.log and see this error:

# tail /var/log/xen/xen-hotplug.log
/etc/xen/scripts/vif-bridge: line 84: setup_bridge_port: command not found

Then edit the /etc/xen/scripts/xen-network-common.sh script removing the _ (underscore) from the _setup_bridge_port command. This should fix the problem and allow you to start your VM.

Star Wars - Lego Hobbit - Go Sushi!

Revert to a previous Boot Environment - Solaris 11

Revert to a previous Boot Environment:

beadm list
beadm activate solaris-backup-1
reboot

How to set CentOS/Redhat to auto update

# yum update -y
# yum install yum-cron
# chkconfig yum-cron on