Missing directory in /var/run or /run – tmpfiles.d

Sometimes is happens, that an application/demon refuses to start because of missing files/directories in /var/run.
The first solution is:
  • Create the directory in /var/run
  • Change the permissions
and everything is fine.

Not really.

After the next reboot, the directory is missing again and you have to go for the "first" solution again.

The right solution works like this:
Inside /usr/lib/tmpfiles.d create a myexample.conf file with this content:
        d /var/run/myexample  (more...)

MySQL 8: New Features

After installing mysql 8 on my ubuntu i did a lookaround for the new features. Oracle itself stated:

This is really cool, but how to test this?
A first look inside the standard data directory /var/lib/mysql shows:
/var/lib/mysql# ls -l
insgesamt 168012
-rw-r----- 1 mysql mysql       56 Aug 17 20:53 auto.cnf
-rw-r----- 1 mysql mysql      498 Aug 17 20:53 binlog.000001
-rw-r----- 1 mysql mysql      554 Aug 17 21:07 binlog.000002
-rw-r----- 1 (more...)

mysql 8: installation on ubuntu

Today i tried to install mysql 8 on my ubuntu:
First i visited the site https://dev.mysql.com/downloads/repo/apt/ which says:
So i downloaded this file (https://dev.mysql.com/get/mysql-apt-config_0.8.10-1_all.deb) and here we go:

# dpkg -i mysql-apt-config_0.8.10-1_all.deb 

Vormals nicht ausgewähltes Paket mysql-apt-config wird gewählt.

(Lese Datenbank ... 414911 Dateien und Verzeichnisse sind derzeit installiert.)

Vorbereitung zum Entpacken von mysql-apt-config_0.8.10-1_all.deb ...

Entpacken von mysql-apt-config (0.8.10-1) ...

(more...)

systemd: systemd-notify not working for non-root-users

Sometimes you have to write your own startup scripts. Recent linux distributions require systemd scripts. This is not really a problem except you have to fulfill the following requirements:
  • Run the service as a non-root-user
  • The service has a startup phase and you want to start the next startup scripts after this startup phase
So the systemd-script has to look like this:
# cat /lib/systemd/system/TEST.service
[Unit]
Description=MyTestSystemdConfiguration

[Service]
User=schroff
Type=notify
ExecStart=/home/schroff/bin/test.sh
NotifyAccess=all
The (more...)

Oracle SOA Suite 12c : Audit Levels (Off, Production, Development)

Inside the Enterprise Manager (URL: http://yourhost:7001/em) you can configure SOA Suite Audit Levels:

Choose "Common Properties"

Click on "Change Profile"
The oracle documentation shows the following:



  • Off:
    No business flow instance tracking and payload tracking information is collected. Drilling down into a flow shows the components and their status. Using this setting limits database growth, and also helps reduce latency and improve throughput.
  • Production:
    Flow and audit event information is collected and (more...)

Ubuntu / Linux: WLAN connections fails with "denied authentication (status 17)"

During holidays i was not able to connect my laptop to the WLAN.
The /var/log/syslog showed the following:
Jul 15 13:45:20 pc wpa_supplicant[935]: wlp3s0: SME: Trying to authenticate with 14:9d:09:fe:a4:b3 (SSID='HUAWEI BTV' freq=2437 MHz)
Jul 15 13:45:20 pc kernel: [ 6972.826888] wlp3s0: authenticate with 14:9d:09:fe:a4:b3
Jul 15 13:45:20 pc NetworkManager[797]:   [1531655120.4746] device (wlp3s0): supplicant interface state: disconnected -> authenticating
Jul 15 13:45:20 pc kernel: [ 6972.829942] wlp3s0: send auth to 14:9d:09:fe:a4:b3 (more...)

Where to find the oracle-database-ee-18c-1.0-1.x86_64.rpm package?

After writing about the release of Oracle database 18c i wanted to download
oracle-database-ee-18c-1.0-1.x86_64.rpm
to try the rpm-based installation.
But this rpm is not included in
LINUX.X64_180000_db_home.zip
The oracle documentation shows:
 But on OTN and Delivery Cloud only the zipfile without the rpm can be downloaded...

So let's see, when the download pages are updated...

Oracle Weblogic 12c: Extracting the complete configuration via wlst.sh python script

If you want to get all information out of a weblogic server via wlst.sh than you can use the following script:
# written by Dietrich Schroff 2018
import sys


OutputFile='myfile.txt'
sys.stdout = open(OutputFile,'w')
connect('weblogic','mypasswd','t3://localhost:7001')
depth=0

def loopOverAllSubdirectories(goIntoThisDirectory,depth):
    depth=depth+1
    cd(goIntoThisDirectory)
    print depth," "*depth*2,goIntoThisDirectory
    try:
            completeInput=ls()
            inputArray=completeInput.split('\n')
        allParameters=[ x for x in inputArray if (not ("dr--" in x) or ("drw-" in x)) ]
(more...)

Oracle 18c database is released for Linux (on premise)

After my posting nearly a week ago about the published 18c documentation on monday the binaries for Oracle 18c database were released:


and

 Here the link to the download page: oracle.com

In one of the next postings i will try a rpm installation...

Oracle Database 18c: Documentation released!

Today i surfed to docs.oracle.com and there i found the documentation for oracle database 18c:


In march 2018 i wrote about the new installation procedure of oracle database 18c via rpm, which was announced inside the "new features".

The installation guide for Linux contains now the commands for installing the database via rpm. Here a screencopy of chapter 11:
 rpm -ivh oracle-ee-db-18.1.0.0.0-1.x86_64.rpm
This command creates the (more...)

Oracle SOA Suite: Profiles (SOA Foundation, BPEL only, Orchestration, Enterprise, BPM Classic, …)

Inside the Enterprise Manager (URL: http://yourhost:7001/em) you can configure SOA Suite profiles:

Choose "Common Properties"

Click on "Change Profile"
The oracle documentation shows the following:

The full set of adapters:
  • file,
  • FTP, 
  • database, 
  • JMS, 
  • MQSeries, 
  • AQ, 
  • E-Business Suite, 
  • User Messaging Service, 
  • socket, 
  • LDAP, 
  • Coherence, 
  • MSMQ,
  • JDE
The limited set of adapters:
  • file, 
  • FTP, 
  • database, 
  • JMS, 
  • MQSeries, 
  • AQ, 
  • E-Business Suite,
  • User Messaging Service

Docker: Networking with docker swarm: creating new subnets/gateways/…

In this posting i explained how to configure the network for a container on a docker machine.
If you want to do this for a docker swarm, you have to change the commands. The network driver "bridge" does not work in swarm mode:
(How to run a container inside a swarm take a look here)

docker service create  --network mybrigde --name helloworld alpine ping 192.168.178.1

Error: No such network: mybrigde
Even (more...)

Oracle Database Software Downloads: 18c released

Ok - not the database binaries but the Oracle Database 18c Release 1 Client is released:

Only for windows and linux - not really suprising, but that shows, which platforms are well supported ;-)

The documentation can be found here.


The documentation is for solaris, too - but without binaries this sounds a little bit strange:

Docker: Network configuration: How to customize the network bridge and use my own subnet / netmask / CiDR

In my last posting i described how to configure the network settings of a container via docker command line:
--net none
--net bridge
Now i want to try to change the subnet from the standard 172.17.0.0/16 to another ip range.

There are some tutorials out there which say:

docker run -it  --net bridge  --fixed-cidr "10.100.0.0/24"  alpine /bin/ash
unknown flag: --fixed-cidr
but this doesa not work any more.

First you (more...)

Ubuntu 16.04: Installation of chrome-browser fails with libnss3 (>= 2:3.22) [2]


The first solution for installing google-chrome after getting the error
dpkg: Abhängigkeitsprobleme verhindern Konfiguration von google-chrome-stable:
 google-chrome-stable hängt ab von libnss3 (>= 2:3.22); aber:
  Version von libnss3:amd64 auf dem System ist 2:3.21-1ubuntu4.

dpkg: Fehler beim Bearbeiten des Paketes google-chrome-stable (--install):
 Abhängigkeitsprobleme - verbleibt unkonfiguriert
was to install chromium (see this posting).

But now i know, what the problem was:
Inside /etc/apt/sources.list the entry:
deb http://security.ubuntu.com/ubuntu/ xenial-security restricted main (more...)

Docker: Network configuration – none / brigde / hostname / dns entries

If you are starting your docker container you can add some network configuration details via command line.
Let's start with the easiest network setting:
docker run -it  --net none alpine /bin/ash
This setting starts the container without any connectivity to the network:
# ip addr show
1: lo: mtu 65536 qdisc noqueue state UNKNOWN qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
(more...)

Docker: How to limit memory

By starting your container you can limit the RAM usage simply by adding
-m 4M

(this limits the memory to 4 megabytes).

To check this simply run:

docker run -it -m=4M  --rm alpine /bin/ash

and on your docker machine check the following entry:

alpine:~# cat /sys/fs/cgroup/memory/docker/4ce0403caf667e7a6d446eac3820373aefafe4e73463357f680d7b38a392ba62/memory.limit_in_bytes 
4194304


Oracle SOAR ?!

Larry Ellison announced yesterday Oracle SOAR:


Soar [https://en.oxforddictionaries.com/definition/soar]:  
Fly or rise high in the air.
‘the bird spread its wings and soared into the air’
It is about migrating into the cloud [press release]:
the world’s first automated enterprise cloud application upgrade product that will enable Oracle customers to reduce the time and cost of cloud migration by up to 30 percent. By providing a complete set of (more...)

Oracle SOA Suite 12c: How to deploy a BPEL onto a weblogic server

After you have created your BPEL inside Jdeveloper, you have to add an application server inside jdev:







 And here we go:

Then go to the applications view:







And after the deployment check via Application Server view, if the BPEL version was deployed:


Docker: Lessons learned – Logging

After some time working with docker here my experiences:

Some days ago i created my own container with a minimal web service.

Here the ncweb.sh:
#!/bin/ash
sed -i  's/Hostname:.*/Hostname: '$HOSTNAME'/g' index.html
while true; do { echo -e 'HTTP/1.1 200 OK\r\n'; cat index.html;}  | nc  -l -p 8080  2>&1 >> logfile; done
This is the Dockerfile:
FROM alpine

WORKDIR /tmp

RUN mkdir ncweb

ADD .  /tmp

ENTRYPOINT [ "/tmp/ncweb.sh" (more...)