Friday, August 31, 2018

building .net applications on a docker image

The pain is that you can't run a Windows docker image on Linux. And Microsoft images with the .net libraries are all Windows.
Like this one

BUT you can build a ubuntu-based docker builder image:

it's available on docker hub as vernetto/ubuntudotnet:1.0

Ref: how to push to docker hub

how to submit a container to an image and save it as tar

Monday, August 27, 2018

docker latest update fails miserably

sudo journalctl -xe

mkdir /run/containerd/io.containerd.runtime.v2.task/docker/dockerd: file exists: unknown

it seems a bug of the latest (nightly) release.... which was installed automatically by the Centos updates process.

I uninstall everything:

sudo yum remove docker docker-common docker-selinux docker-engine

Then I install

sudo yum-config-manager --disable docker-ce-edge

sudo yum install docker-ce
sudo systemctl enable docker
systemctl start docker

systemctl status docker.service

Error starting daemon: error initializing graphdriver: /var/lib/docker contains several valid graphdrivers: devicemapper, overlay2; Please cleanup or explicit

sudo vi /usr/lib/systemd/system/docker.service

ExecStart=/usr/bin/dockerd -s=devicemapper -H tcp:// -H unix:///var/run/docker.sock

sudo systemctl daemon-reload
sudo systemctl start docker

Friday, August 24, 2018

Nexus 3.10 as Python pypi proxy

sudo yum -y update
sudo yum -y install python-pip
pip --help
pip -V
mkdir ~/.pip
cd .pip/
vi pip.conf

enter this:

index = http://localhost:8181/repository/pypi/
index-url = http://localhost:8181/repository/pypi/simple

Create a nexus Pypi proxy repo "pypi" pointing to . Leave all the defaults as they are.

pip install lino-amici

this should populate your nexus:

Looking in indexes: http://localhost:8181/repository/pypi/simple
Collecting lino-amici
  Downloading http://localhost:8181/repository/pypi/packages/eb/c3/7bdd189fd446effe7ea61d2136dfaec478ec7c5b84f694c6b6e43656f319/lino-amici-18.8.0.tar.gz
Collecting lino-xl (from lino-amici)
  Downloading http://localhost:8181/repository/pypi/packages/02/34/6ab429aac3f80aa64fd00c8f3dd76a9ca9ecf25d7e03f1e48981c7031542/lino-xl-18.4.0.tar.gz (2.3MB)
    100% |████████████████████████████████| 2.3MB 92.2MB/s 
Collecting vobject (from lino-amici)
  Downloading http://localhost:8181/repository/pypi/packages/da/ce/27c48c0e39cc69ffe7f6e3751734f6073539bf18a0cfe564e973a3709a52/vobject- (58kB)
    100% |████████████████████████████████| 61kB 19.8MB/s 
Collecting lino (from lino-xl->lino-amici)
  Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ReadTimeoutError("HTTPConnectionPool(host='localhost', port=8181): Read timed out. (read timeout=15)",)': /repository/pypi/packages/68/9e/39e5e96b9b8273f0f29943cddd51873ec670657ccf9918727d97ca6628e2/lino-18.8.0.tar.gz
  Downloading http://localhost:8181/repository/pypi/packages/68/9e/39e5e96b9b8273f0f29943cddd51873ec670657ccf9918727d97ca6628e2/lino-18.8.0.tar.gz (10.6MB)
    100% |████████████████████████████████| 10.6MB 89.8MB/s 
Collecting odfpy (from lino-xl->lino-amici)
  Downloading http://localhost:8181/repository/pypi/packages/01/0f/c9971c99d0d06024a1652f467427ff3f1a1136237e5740da715c5b208a48/odfpy-1.3.6.tar.gz (691kB)
    100% |████████████████████████████████| 696kB 42.6MB/s 
Collecting bleach (from lino-xl->lino-amici)
  Downloading http://localhost:8181/repository/pypi/packages/94/aa/0f7ce53f8688bb9f80c0cffacc3964ddfe08321c509c0bfe5062848951f9/bleach-2.1.4-py2.py3-none-any.whl
Collecting weasyprint (from lino-xl->lino-amici)
  Downloading http://localhost:8181/repository/pypi/packages/7e/4c/cf2ec7abf7f84a2d1325d01dcac1d4bcb77f41117101fe564eb76952c65f/WeasyPrint-0.42.3.tar.gz (399kB)
    100% |████████████████████████████████| 409kB 37.7MB/s 
    Complete output from command python egg_info:
    error in WeasyPrint setup command: Invalid environment marker: python_version < "3.0"
Command "python egg_info" failed with error code 1 in /tmp/pip-install-sPdLGr/weasyprint/

No worries about the message about the python version.... I have 2.7.... not willing to upgrade for now...

Wednesday, August 22, 2018

shell input validation

shell scripting STINKS, and to make it better we should at least make it more robust.

For instance by validating input parameters

Arrays are a great and simple way to achieve this.

array=(pippo pluto topolino)
printf '%s ' "${array[@]}"
printf  '\n'
if [[ ! " ${array[@]} " =~ " ${value} " ]]; then
  echo "array doesnt contain value $value"

Tuesday, August 14, 2018

Oracle DB Invalid Objects

Some usefuls commands to troubleshoot:

select count(*) from USER_OBJECTS where OBJECT_TYPE = 'TABLE';
select count(*) from user_objects where object_type='TYPE';
select count(*) from user_tables;

select * from USER_OBJECTS where STATUS = 'INVALID';

exec dbms_utility.compile_schema( 'MYUSER' );

alter package MYPACKAGE COMPILE;


show errors;

select * from user_errors ;


Thursday, August 2, 2018

CDI and WELD suck

A @Stateless bean could not be injected because not found by WELD

org.jboss.weld.exceptions.DeploymentException: WELD-001408: Unsatisfied dependencies for type PersistenceService with qualifiers @Default
  at injection point [BackedAnnotatedField] @Inject private

 at org.jboss.weld.bootstrap.Validator.validateInjectionPointForDeploymentProblems(
 at org.jboss.weld.bootstrap.Validator.validateInjectionPoint(
 at org.jboss.weld.bootstrap.Validator.validateGeneralBean(
 at org.jboss.weld.bootstrap.Validator.validateRIBean(
 at org.jboss.weld.bootstrap.Validator.validateBean(
 at org.jboss.weld.bootstrap.ConcurrentValidator$1.doWork(
 at org.jboss.weld.bootstrap.ConcurrentValidator$1.doWork(
 at org.jboss.weld.executor.IterativeWorkerTaskFactory$
 at org.jboss.weld.executor.IterativeWorkerTaskFactory$
 at java.util.concurrent.ThreadPoolExecutor.runWorker(
 at java.util.concurrent.ThreadPoolExecutor$

Even if the bean is a session bean, the archive (.jar) is not an “explicit bean archives (basically any archive containing the beans.xml file)“ because it doesn’t contain a beans.xml file (only the war file has a beans.xml file).

Since CDI 1.1 an archive can be implicit : “An implicit bean archive is any archive that contains one or more classes annotated with a bean defining annotation (scope annotation) or one or more session beans.”. Implicit archives don’t need a beans.xml.

But by default “implicit” is disabled! To enable it, you can either do the jboss-all.xml trick or do the “subsystem=weld:write-attribute(name=require-bean-descriptor,value=true)” trick. See again for more details. Or, you can simply add a beans.xml to the JAR.

If all this sounds to you like complete chaos and needless complication, it’s because it is!