DevSecOps Notes

Problem 1 systemctl status docker.service ● docker.service - Docker Application Container Engine    Loaded: loaded (/lib/systemd/system/docker.service; enabled; vendor preset: enabled)    Active: failed (Result: exit-code) since CEST; 52s ago      Docs: https://docs.docker.com   Process: 16473 ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock (code=exited, status=203/EXEC)  Main PID: 16473 (code=exited, status=203/EXEC)  systemd[1]: docker.service: Service hold-off time over, scheduling restart.  systemd[1]: docker.service: Scheduled restart job, restart counter is at 3.  systemd[1]: Stopped Docker Application Container Engine.  systemd[1]: docker.service: Start request repeated too quickly.  systemd[1]: docker.service: Failed with result 'exit-code'.  systemd[1]: Failed to start Docker Application Container Engine. Troubleshooting journalctl -xe -- Subject: Un...

1. Silniki -mysql  -mariadb -aurora -bez serwerowa baza danych automatycznie rozklada sie pomiedzy avaiblity zones

Problem 1:  Error message is display: Error lunching source instance: Unsupported: The requested configuration is currently not supported. Please check the documentation for supported. Please check the documentation for supported configuration during running terraform apply. Possible solution nr 1 :  Change aws region. Possible solution nr 2 : Check if you not using t2 instance type. And if is change it to t3 (it is not require additional costs).

1) Source Control a) Centralized - Free: Subversion, CVS - Commercial: ClearCase, Perforce, team Foundation Server (TFS) - Requieres connection to central server for most operations b) Decentralized / Distributed - Mercural (Hg) - Git - Most operations are local - Central server not required 2) Git overview - Distributed  source control system, not required to be decentralized - massively scales - open source - developed for Linux project requirements - most operations are local - very fast - active community - Most popular DVCS, VCS 3) Key Concepts - Repository contains files, history, config managed by Git - Three State of Git   * working directory - is a directory or folder on your computer   * staging area - pre-commit holding area   * commit - Git Repository (history) Basic Git Workflow Life Cycle a) Local - Working Directory - is the directory or folder on your computer, that holds all the project or appli...

1)  https://landscape.cncf.io/  - Cloud Native Computing Faundation

1. What is a Citrix NetScaler? The Citrix NetScaler product line optimizes  the deliver of applications over the Internet and private networks, combining application-level security, optimizations and traffic managment into a single, integrated appliance. The NetScaler features that enable and the policies you set are then applied to incoming and outgoing traffic. The NetScaler system is an integrated web application delivery controller that slashed server and bandwidth requierments, cutting the costs of delivering enterprise application in half . The NetScaler system gives IT managers the ability to instantly tap unrealized efficiency gains across all phases of the application life cycle, without having to become application experts. The NetScaler system functions as an application accelerator through caching and HTTP compression. It also provides advanced managment  using layer-4 through layer-7 load balancing  and content switching functions. The NetScaler syste...

1. Prons of Oracle DB a) Security b) Performance c) Scalability d) Powerful coding -SQL -PL/SQL e) Support f) biggest companies use it? 2. Are they any cons for this database? -You must know how to deal with the database - It is not free 3. Database build a) tables - main object ytpe in dbs - the data is stored in tables with logical groups. For example, in this figure, we store the data of the employees in our company. We do not have any information about the customers, or products etc. All the data is related to each other. b) cells - each cell has "1" data in it. c) record (row) - the union of all these horizontal cells is called as a "record" , or a "row". A record , or a row includes all the information of a specific element. In here ,since we store the employees a row has all the data oa specific epmployee. d) columns  - records can have any different types of data, but a column can have only one specific type of data. ...

Database - a database is, a place that we store an organized collection of data. collection of tables. Atribute of db: -store -access -manipulate -retrive Database consist of: -storage -memory -processor -software Database Managment Systems - the collection of programs that enable the users to access the database amd manipulate, retrive data to the users. Types of DBMS: a) Hierarchical DBMS - this type of DBMS users the parent-child relationship for stroing the data. It stores the data like a tree with nodes and branches. The registry usage of Windows XP is a good example for this DBMS type. -but this type of DBMS is used so rarely nowadays. so no need to go further for this type. b) Network DBMS -RDM Server is an example of this type. -This type uses many to many relations. But this type generally results complex database structures. -so it is not a frequently used DBMS model. c) Relational DBMS -this type is the most used DBMS nowadays. -the Or...