NTP Server Clock Adjustment with Chrony Amina Elbatoul Dinar, Boualem Merabet, and Samir Ghouali Abstract As of now, all servers have an equipment or programming clock to which reference is made to time stamp records, exchanges, messages, and so forth. This clock, albeit structured around a quartz oscillator, floats like any customary watch, which implies this common watch cannot a match to such created machines that are networked and share common resources like file systems. For example, UNIX is a development tool which makes command, based on its work on comparing file modification dates. Similarly, the correlation of log messages from several systems becomes very difficult if they are not at the same time. In this article, we will concen- trate on this topic by designing a server utilizing the NTP convention since the primary “focus” of the NTP usage is UNIX frameworks, and to be more explicit, we will see the management of the NTP server with the Chrony tool. Keywords Network time protocol · Servers synchronization · Chrony · Kali linux 1 Introduction On servers, numerous procedures use time [1–4], some record the hour of a client’s association in a log, others the hour of a request for an online deals framework for instance. Time exactness turns out to be especially basic when a few machines cooperate; they need a period estimation to synchronize their activities. A. E. Dinar (B ) · B. Merabet · S. Ghouali Faculty of Sciences and Technology, Mustapha Stambouli University, Mascara, Algeria e-mail: amina.dinar@univ-mascara.dz B. Merabet e-mail: boualem19985@yahoo.fr S. Ghouali e-mail: s.ghouali@univ-mascara.dz A. E. Dinar LSTE Laboratory, University Mustapha Stambouli of Mascara, Mascara, Algeria S. Ghouali STIC Laboratory, Faculty of Engineering, University of Tlemcen, Tlemcen, Algeria © The Editor(s) (if applicable) and The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2021 J. K. Mandal et al. (eds.), Applications of Internet of Things, Lecture Notes in Networks and Systems 137, https://doi.org/10.1007/978-981-15-6198-6_16 177