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David Cao

David is a Cloud & DevOps Enthusiast. He has years of experience as a Linux engineer. He had working experience in AMD, EMC. He likes Linux, Python, bash, and more. He is a technical blogger and a Software Engineer. He enjoys sharing his learning and contributing to open-source.

The “unable to resolve host address” error in wget occurs when the tool is unable to resolve the domain name of the host you’re trying to access. This could be due to various reasons, such as DNS server issues, network connectivity problems, or incorrect URLs. 10 ways to fix unable to resolve host address in …

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The error “Unable to locally verify the issuer’s authority” means wget cannot verify the SSL certificate of the website you’re trying to connect to. This usually happens when wget doesn’t have access to the necessary CA certificates to verify the website’s certificate. Here are a few possible ways to resolve the issue: Install/Update the CA …

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Network command in Linux ifconfig Display network interface configuration. ip addr Show IP addresses and network interfaces. ip route Display the routing table. ping Test network connectivity to a host. traceroute Trace the route packets take to a host. netstat Show network statistics and connections. ss Similar to netstat, show socket statistics. nslookup Query DNS …

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Ansible is a powerful and flexible automation tool, capable of handling many complex tasks, including modifying files. Three of the key modules that Ansible provides for file modification are lineinfile, replace, and blockinfile. The lineinfile module is used when you need to manage lines in text files. It can ensure a particular line is present …

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In the realm of IT automation, Ansible has emerged as a powerful tool for streamlining various administrative tasks. Among these tasks, user management stands out as a common and often repetitive process. Ansible provides two primary approaches for creating users: ad-hoc commands and playbooks. This article aims to shed light on both ad-hoc commands and …

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The error message “curl: (60) SSL certificate problem: unable to get local issuer certificate” typically indicates a problem with the certificate of the server you’re trying to connect to or the certificate chain leading up to a trusted certificate authority. To establish a secure connection, curl tries to verify the server’s certificate against a list …

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understanding user password authentication in Linux The user authentication process in Linux typically involves validating the entered credentials against the stored user information in the /etc/passwd and /etc/shadow files. When a user attempts to log in, they provide a username and password. The system then performs the following steps to authenticate the user: The system …

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