Does a computer system (Linux) only have one host name?












3















hostname is used to display the system's DNS name, and to display or set its hostname or NIS domain name.



Does a computer system (Linux) only have one host name?



In virtual hosting, several host names can be resolved to different root directories in a web server. If a computer system (Linux) can only have one host name, how is virtual hosting possible?



Thanks.






linux hostname







share|improve this question

























  • DNS A or AAA records point to the same IP address for multiple domains. The hostname of the machine is not necessarily important.

    – RubberStamp
    5 hours ago











  • (1) Is the output of hostname ever used in resolving hostname to IP address? (2) A means IPv4 address, AAAA IPv6. What is AAA?

    – Tim
    5 hours ago













  • mDNS services, such as avahi depend on the machine hostname. In that case, hostname.local would resolve to the local IP address of the machine. I see someone wrote an answer which is an expansion of my first comment... too simultaneous for my browser notifications.

    – RubberStamp
    4 hours ago











  • AAA is a 'A' short typo

    – RubberStamp
    4 hours ago








  • 1





    American Automobile Association?

    – Hagen von Eitzen
    3 hours ago
















3















hostname is used to display the system's DNS name, and to display or set its hostname or NIS domain name.



Does a computer system (Linux) only have one host name?



In virtual hosting, several host names can be resolved to different root directories in a web server. If a computer system (Linux) can only have one host name, how is virtual hosting possible?



Thanks.






linux hostname







share|improve this question

























  • DNS A or AAA records point to the same IP address for multiple domains. The hostname of the machine is not necessarily important.

    – RubberStamp
    5 hours ago











  • (1) Is the output of hostname ever used in resolving hostname to IP address? (2) A means IPv4 address, AAAA IPv6. What is AAA?

    – Tim
    5 hours ago













  • mDNS services, such as avahi depend on the machine hostname. In that case, hostname.local would resolve to the local IP address of the machine. I see someone wrote an answer which is an expansion of my first comment... too simultaneous for my browser notifications.

    – RubberStamp
    4 hours ago











  • AAA is a 'A' short typo

    – RubberStamp
    4 hours ago








  • 1





    American Automobile Association?

    – Hagen von Eitzen
    3 hours ago














3












3








3








hostname is used to display the system's DNS name, and to display or set its hostname or NIS domain name.



Does a computer system (Linux) only have one host name?



In virtual hosting, several host names can be resolved to different root directories in a web server. If a computer system (Linux) can only have one host name, how is virtual hosting possible?



Thanks.






linux hostname







share|improve this question
















hostname is used to display the system's DNS name, and to display or set its hostname or NIS domain name.



Does a computer system (Linux) only have one host name?



In virtual hosting, several host names can be resolved to different root directories in a web server. If a computer system (Linux) can only have one host name, how is virtual hosting possible?



Thanks.






linux hostname




linux hostname






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited 5 hours ago









Jeff Schaller

41.3k1056131




41.3k1056131










asked 5 hours ago









TimTim

26.8k77258469




26.8k77258469













  • DNS A or AAA records point to the same IP address for multiple domains. The hostname of the machine is not necessarily important.

    – RubberStamp
    5 hours ago











  • (1) Is the output of hostname ever used in resolving hostname to IP address? (2) A means IPv4 address, AAAA IPv6. What is AAA?

    – Tim
    5 hours ago













  • mDNS services, such as avahi depend on the machine hostname. In that case, hostname.local would resolve to the local IP address of the machine. I see someone wrote an answer which is an expansion of my first comment... too simultaneous for my browser notifications.

    – RubberStamp
    4 hours ago











  • AAA is a 'A' short typo

    – RubberStamp
    4 hours ago








  • 1





    American Automobile Association?

    – Hagen von Eitzen
    3 hours ago



















  • DNS A or AAA records point to the same IP address for multiple domains. The hostname of the machine is not necessarily important.

    – RubberStamp
    5 hours ago











  • (1) Is the output of hostname ever used in resolving hostname to IP address? (2) A means IPv4 address, AAAA IPv6. What is AAA?

    – Tim
    5 hours ago













  • mDNS services, such as avahi depend on the machine hostname. In that case, hostname.local would resolve to the local IP address of the machine. I see someone wrote an answer which is an expansion of my first comment... too simultaneous for my browser notifications.

    – RubberStamp
    4 hours ago











  • AAA is a 'A' short typo

    – RubberStamp
    4 hours ago








  • 1





    American Automobile Association?

    – Hagen von Eitzen
    3 hours ago

















DNS A or AAA records point to the same IP address for multiple domains. The hostname of the machine is not necessarily important.

– RubberStamp
5 hours ago





DNS A or AAA records point to the same IP address for multiple domains. The hostname of the machine is not necessarily important.

– RubberStamp
5 hours ago













(1) Is the output of hostname ever used in resolving hostname to IP address? (2) A means IPv4 address, AAAA IPv6. What is AAA?

– Tim
5 hours ago







(1) Is the output of hostname ever used in resolving hostname to IP address? (2) A means IPv4 address, AAAA IPv6. What is AAA?

– Tim
5 hours ago















mDNS services, such as avahi depend on the machine hostname. In that case, hostname.local would resolve to the local IP address of the machine. I see someone wrote an answer which is an expansion of my first comment... too simultaneous for my browser notifications.

– RubberStamp
4 hours ago





mDNS services, such as avahi depend on the machine hostname. In that case, hostname.local would resolve to the local IP address of the machine. I see someone wrote an answer which is an expansion of my first comment... too simultaneous for my browser notifications.

– RubberStamp
4 hours ago













AAA is a 'A' short typo

– RubberStamp
4 hours ago







AAA is a 'A' short typo

– RubberStamp
4 hours ago






1




1





American Automobile Association?

– Hagen von Eitzen
3 hours ago





American Automobile Association?

– Hagen von Eitzen
3 hours ago










1 Answer
1






active

oldest

votes


















5














Yes, and no. The are two distinct things called hostnames.



The hostname internal to the system and kept by the kernel, the one returned by the hostname command (or the gethostname() call) is unique. It's mostly used for identifying the system, e.g. if you h in Bash's PS1, it expands that to the hostname. Similarly, syslog-style logfiles also include the hostname on log entries.



Then there's also DNS names that are used by other systems to look up the IP address of another. There might be more than one DNS name that point to the same IP address, and so the same host.



The internal hostname and the DNS names don't need to be the same. A web server serving two different domains could have www.example.org and www.example.com both pointing to 192.0.2.9 in DNS, while the internal hostname of the system might be orange.example.org, or something equally unrelated. In that case, the DNS setup would usually have a reverse lookup on 192.0.2.9 point back to the name orange.example.org, but there's nothing to force that.



In addition to that, virtual hosting requires that the browser tell the web server the name of the site it tried to access. Otherwise the server would not know which virtual site the client tried to reach. HTTP has the Host header for that.






share|improve this answer


























  • Thanks. (1) "the DNS setup would usually have 192.0.2.9 point back to the name orange.example.org" Doesn't resolving get IP address for a given host name, why the opposite? (2) Is the output of hostname ever used in resolving hostname to IP address?

    – Tim
    5 hours ago













  • (2) ... When set up a local wifi network in your home from an ISP using a router and modem, the machines in the network can be identified by the outputs of their hostname commands, correct? Does the router act like a DNS to resolve the outputs of hostname to private IP addresses in the network?

    – Tim
    5 hours ago













  • @Tim, (2) uhhuh, I'm not sure. There might be (probably are) systems that automatically discover hosts on the same network, but I'm not too familiar with them. (I know Windows does it, but that doesn't help much.) There would need to be an additional protocol there to communicate the hostnames and IP's and to have them show up as DNS names on the other hosts.

    – ilkkachu
    4 hours ago













  • as for (1), there's also reverse lookups that take the IP address and return a name. (For a system with a single name and a single address, you'd want to have both resolve to the other, just for clarity's sake)

    – ilkkachu
    4 hours ago








  • 1





    Small networks may be using mDNS. For better or worse, it lets system owners choose their own hostnames, accessible by other systems on the local network, without the need to register with a DNS server.

    – Mark Plotnick
    3 hours ago













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1 Answer
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active

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1 Answer
1






active

oldest

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active

oldest

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active

oldest

votes









5














Yes, and no. The are two distinct things called hostnames.



The hostname internal to the system and kept by the kernel, the one returned by the hostname command (or the gethostname() call) is unique. It's mostly used for identifying the system, e.g. if you h in Bash's PS1, it expands that to the hostname. Similarly, syslog-style logfiles also include the hostname on log entries.



Then there's also DNS names that are used by other systems to look up the IP address of another. There might be more than one DNS name that point to the same IP address, and so the same host.



The internal hostname and the DNS names don't need to be the same. A web server serving two different domains could have www.example.org and www.example.com both pointing to 192.0.2.9 in DNS, while the internal hostname of the system might be orange.example.org, or something equally unrelated. In that case, the DNS setup would usually have a reverse lookup on 192.0.2.9 point back to the name orange.example.org, but there's nothing to force that.



In addition to that, virtual hosting requires that the browser tell the web server the name of the site it tried to access. Otherwise the server would not know which virtual site the client tried to reach. HTTP has the Host header for that.






share|improve this answer


























  • Thanks. (1) "the DNS setup would usually have 192.0.2.9 point back to the name orange.example.org" Doesn't resolving get IP address for a given host name, why the opposite? (2) Is the output of hostname ever used in resolving hostname to IP address?

    – Tim
    5 hours ago













  • (2) ... When set up a local wifi network in your home from an ISP using a router and modem, the machines in the network can be identified by the outputs of their hostname commands, correct? Does the router act like a DNS to resolve the outputs of hostname to private IP addresses in the network?

    – Tim
    5 hours ago













  • @Tim, (2) uhhuh, I'm not sure. There might be (probably are) systems that automatically discover hosts on the same network, but I'm not too familiar with them. (I know Windows does it, but that doesn't help much.) There would need to be an additional protocol there to communicate the hostnames and IP's and to have them show up as DNS names on the other hosts.

    – ilkkachu
    4 hours ago













  • as for (1), there's also reverse lookups that take the IP address and return a name. (For a system with a single name and a single address, you'd want to have both resolve to the other, just for clarity's sake)

    – ilkkachu
    4 hours ago








  • 1





    Small networks may be using mDNS. For better or worse, it lets system owners choose their own hostnames, accessible by other systems on the local network, without the need to register with a DNS server.

    – Mark Plotnick
    3 hours ago


















5














Yes, and no. The are two distinct things called hostnames.



The hostname internal to the system and kept by the kernel, the one returned by the hostname command (or the gethostname() call) is unique. It's mostly used for identifying the system, e.g. if you h in Bash's PS1, it expands that to the hostname. Similarly, syslog-style logfiles also include the hostname on log entries.



Then there's also DNS names that are used by other systems to look up the IP address of another. There might be more than one DNS name that point to the same IP address, and so the same host.



The internal hostname and the DNS names don't need to be the same. A web server serving two different domains could have www.example.org and www.example.com both pointing to 192.0.2.9 in DNS, while the internal hostname of the system might be orange.example.org, or something equally unrelated. In that case, the DNS setup would usually have a reverse lookup on 192.0.2.9 point back to the name orange.example.org, but there's nothing to force that.



In addition to that, virtual hosting requires that the browser tell the web server the name of the site it tried to access. Otherwise the server would not know which virtual site the client tried to reach. HTTP has the Host header for that.






share|improve this answer


























  • Thanks. (1) "the DNS setup would usually have 192.0.2.9 point back to the name orange.example.org" Doesn't resolving get IP address for a given host name, why the opposite? (2) Is the output of hostname ever used in resolving hostname to IP address?

    – Tim
    5 hours ago













  • (2) ... When set up a local wifi network in your home from an ISP using a router and modem, the machines in the network can be identified by the outputs of their hostname commands, correct? Does the router act like a DNS to resolve the outputs of hostname to private IP addresses in the network?

    – Tim
    5 hours ago













  • @Tim, (2) uhhuh, I'm not sure. There might be (probably are) systems that automatically discover hosts on the same network, but I'm not too familiar with them. (I know Windows does it, but that doesn't help much.) There would need to be an additional protocol there to communicate the hostnames and IP's and to have them show up as DNS names on the other hosts.

    – ilkkachu
    4 hours ago













  • as for (1), there's also reverse lookups that take the IP address and return a name. (For a system with a single name and a single address, you'd want to have both resolve to the other, just for clarity's sake)

    – ilkkachu
    4 hours ago








  • 1





    Small networks may be using mDNS. For better or worse, it lets system owners choose their own hostnames, accessible by other systems on the local network, without the need to register with a DNS server.

    – Mark Plotnick
    3 hours ago
















5












5








5







Yes, and no. The are two distinct things called hostnames.



The hostname internal to the system and kept by the kernel, the one returned by the hostname command (or the gethostname() call) is unique. It's mostly used for identifying the system, e.g. if you h in Bash's PS1, it expands that to the hostname. Similarly, syslog-style logfiles also include the hostname on log entries.



Then there's also DNS names that are used by other systems to look up the IP address of another. There might be more than one DNS name that point to the same IP address, and so the same host.



The internal hostname and the DNS names don't need to be the same. A web server serving two different domains could have www.example.org and www.example.com both pointing to 192.0.2.9 in DNS, while the internal hostname of the system might be orange.example.org, or something equally unrelated. In that case, the DNS setup would usually have a reverse lookup on 192.0.2.9 point back to the name orange.example.org, but there's nothing to force that.



In addition to that, virtual hosting requires that the browser tell the web server the name of the site it tried to access. Otherwise the server would not know which virtual site the client tried to reach. HTTP has the Host header for that.






share|improve this answer















Yes, and no. The are two distinct things called hostnames.



The hostname internal to the system and kept by the kernel, the one returned by the hostname command (or the gethostname() call) is unique. It's mostly used for identifying the system, e.g. if you h in Bash's PS1, it expands that to the hostname. Similarly, syslog-style logfiles also include the hostname on log entries.



Then there's also DNS names that are used by other systems to look up the IP address of another. There might be more than one DNS name that point to the same IP address, and so the same host.



The internal hostname and the DNS names don't need to be the same. A web server serving two different domains could have www.example.org and www.example.com both pointing to 192.0.2.9 in DNS, while the internal hostname of the system might be orange.example.org, or something equally unrelated. In that case, the DNS setup would usually have a reverse lookup on 192.0.2.9 point back to the name orange.example.org, but there's nothing to force that.



In addition to that, virtual hosting requires that the browser tell the web server the name of the site it tried to access. Otherwise the server would not know which virtual site the client tried to reach. HTTP has the Host header for that.







share|improve this answer














share|improve this answer



share|improve this answer








edited 4 hours ago

























answered 5 hours ago









ilkkachuilkkachu

58.4k890164




58.4k890164













  • Thanks. (1) "the DNS setup would usually have 192.0.2.9 point back to the name orange.example.org" Doesn't resolving get IP address for a given host name, why the opposite? (2) Is the output of hostname ever used in resolving hostname to IP address?

    – Tim
    5 hours ago













  • (2) ... When set up a local wifi network in your home from an ISP using a router and modem, the machines in the network can be identified by the outputs of their hostname commands, correct? Does the router act like a DNS to resolve the outputs of hostname to private IP addresses in the network?

    – Tim
    5 hours ago













  • @Tim, (2) uhhuh, I'm not sure. There might be (probably are) systems that automatically discover hosts on the same network, but I'm not too familiar with them. (I know Windows does it, but that doesn't help much.) There would need to be an additional protocol there to communicate the hostnames and IP's and to have them show up as DNS names on the other hosts.

    – ilkkachu
    4 hours ago













  • as for (1), there's also reverse lookups that take the IP address and return a name. (For a system with a single name and a single address, you'd want to have both resolve to the other, just for clarity's sake)

    – ilkkachu
    4 hours ago








  • 1





    Small networks may be using mDNS. For better or worse, it lets system owners choose their own hostnames, accessible by other systems on the local network, without the need to register with a DNS server.

    – Mark Plotnick
    3 hours ago





















  • Thanks. (1) "the DNS setup would usually have 192.0.2.9 point back to the name orange.example.org" Doesn't resolving get IP address for a given host name, why the opposite? (2) Is the output of hostname ever used in resolving hostname to IP address?

    – Tim
    5 hours ago













  • (2) ... When set up a local wifi network in your home from an ISP using a router and modem, the machines in the network can be identified by the outputs of their hostname commands, correct? Does the router act like a DNS to resolve the outputs of hostname to private IP addresses in the network?

    – Tim
    5 hours ago













  • @Tim, (2) uhhuh, I'm not sure. There might be (probably are) systems that automatically discover hosts on the same network, but I'm not too familiar with them. (I know Windows does it, but that doesn't help much.) There would need to be an additional protocol there to communicate the hostnames and IP's and to have them show up as DNS names on the other hosts.

    – ilkkachu
    4 hours ago













  • as for (1), there's also reverse lookups that take the IP address and return a name. (For a system with a single name and a single address, you'd want to have both resolve to the other, just for clarity's sake)

    – ilkkachu
    4 hours ago








  • 1





    Small networks may be using mDNS. For better or worse, it lets system owners choose their own hostnames, accessible by other systems on the local network, without the need to register with a DNS server.

    – Mark Plotnick
    3 hours ago



















Thanks. (1) "the DNS setup would usually have 192.0.2.9 point back to the name orange.example.org" Doesn't resolving get IP address for a given host name, why the opposite? (2) Is the output of hostname ever used in resolving hostname to IP address?

– Tim
5 hours ago







Thanks. (1) "the DNS setup would usually have 192.0.2.9 point back to the name orange.example.org" Doesn't resolving get IP address for a given host name, why the opposite? (2) Is the output of hostname ever used in resolving hostname to IP address?

– Tim
5 hours ago















(2) ... When set up a local wifi network in your home from an ISP using a router and modem, the machines in the network can be identified by the outputs of their hostname commands, correct? Does the router act like a DNS to resolve the outputs of hostname to private IP addresses in the network?

– Tim
5 hours ago







(2) ... When set up a local wifi network in your home from an ISP using a router and modem, the machines in the network can be identified by the outputs of their hostname commands, correct? Does the router act like a DNS to resolve the outputs of hostname to private IP addresses in the network?

– Tim
5 hours ago















@Tim, (2) uhhuh, I'm not sure. There might be (probably are) systems that automatically discover hosts on the same network, but I'm not too familiar with them. (I know Windows does it, but that doesn't help much.) There would need to be an additional protocol there to communicate the hostnames and IP's and to have them show up as DNS names on the other hosts.

– ilkkachu
4 hours ago







@Tim, (2) uhhuh, I'm not sure. There might be (probably are) systems that automatically discover hosts on the same network, but I'm not too familiar with them. (I know Windows does it, but that doesn't help much.) There would need to be an additional protocol there to communicate the hostnames and IP's and to have them show up as DNS names on the other hosts.

– ilkkachu
4 hours ago















as for (1), there's also reverse lookups that take the IP address and return a name. (For a system with a single name and a single address, you'd want to have both resolve to the other, just for clarity's sake)

– ilkkachu
4 hours ago







as for (1), there's also reverse lookups that take the IP address and return a name. (For a system with a single name and a single address, you'd want to have both resolve to the other, just for clarity's sake)

– ilkkachu
4 hours ago






1




1





Small networks may be using mDNS. For better or worse, it lets system owners choose their own hostnames, accessible by other systems on the local network, without the need to register with a DNS server.

– Mark Plotnick
3 hours ago







Small networks may be using mDNS. For better or worse, it lets system owners choose their own hostnames, accessible by other systems on the local network, without the need to register with a DNS server.

– Mark Plotnick
3 hours ago




















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數位音樂下載

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數位音樂下載 為非以「實體」方式來販賣音樂的相關產品，而使用數位格式如mp3、AAC等文件格式來進行銷售販賣的一种音乐产业形式。著名的數位音樂下載服務商有iTunes Store、RecoChoku、Google Play音乐和微软Zune等。数字音乐下载在二十一世纪初一度风靡全球， [1] [2] 使得传统唱片产业走向衰落，但其自身也在2010年代流媒体音乐服务如Apple Music、Spotify等的挤压下迅速失去市场份额。 [3] [4] 数字音乐下载有便于携带、传播迅速、制作简单成本低等优点，与流媒体音乐相比也能更好保障音乐人权益； [5] 但它同时很可能带来侵犯版权和滥用的情形， [6] 也给音乐产业带来了诸多不利影响。数字音乐下载为音乐人和乐迷提供了更加便捷直接的交流渠道，也一定程度上推动了网络音乐人的出现和独立音乐的迅速发展。 [7] 目录 1 历史 1.1 技术积淀（1987-2000） 1.2 出现与兴起（2000-2004） 1.3 唱片市场的颠覆者（2004-2007） 1.4 巅峰和衰落（2005-2013） 1.5 摇摇欲坠的现状与不可预知的明天（2014至今） 2 主要文件格式 2.1 PCM编码格式 2.1.1 WAV 2.1.2 APE 2.1.3 FLAC 2.2 苹果推出的无损文件格式 2.2.1 AIFF 2.2.2 ALAC 2.3 有损压缩格式 2.3.1 MP3 2.3.2 AAC 3 主要市场 3.1 iTunes Store 3.2 Google Play音乐商店 3.3 亚马逊音乐商店 3.4 部分其他音乐商店 4 影响与评价 4.1 对音乐产业的影响 4.2 对科技行业的影响 4.3 正面评价 4.4 负面评价 4.4.1 侵权问题 4.4.2 经营模式不明晰 4.4.3 不适应移动时代 4.5 文化现象 5 延伸阅读 6 参考资料 历史 苹果iTunes+iPod的软硬件搭配让数字音...
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When can things happen in Etherscan, such as the picture below?

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2 I don't know why balance of the address is 0. when can this situation? etherscan balances share | improve this question asked yesterday Ru Hi Ru Hi 11 1 New contributor Ru Hi is a new contributor to this site. Take care in asking for clarification, commenting, and answering. Check out our Code of Conduct. add a comment  |  ...
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格利澤436b

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格利泽436b 太陽系外行星 太陽系外行星列表 艺术家笔下的格利泽436b 母恆星 母恆星 Gliese 436 星座 獅子座 赤經 ( α ) 11 h  42 m  11.0941 s [1] 赤緯 ( δ ) +26° 42′ 23.652″ [1] 距離 33.4 ly (10.2 pc) 光譜類型 M2.5 V [1] 軌道參數 半长轴 ( a ) 0.0291±0.0004 [2] AU 軌道離心率 ( e ) 0.150±0.012 [2] 公轉週期 ( P ) 2.643904±0.000005 [3] d (0.00723849 y) 軌道傾角 ( i ) 85.8 +0.21 −0.25 [3] ° 角距 ( θ ) 2.794 mas 近星點時間 ( T 0 ) 2,451,551.716 ±0.01 JD 半振幅 ( K ) 18.68±0.8 m/s 物理性质 质量 ( m ) 22.2±1.0 [2] M ⊕ 半徑 ( r ) 4.327±0.183 [2] [4] R ⊕ 密度 ( ρ ) 1.51 g cm -3 表面重力 ( g ) 1.18 g 溫度 ( T ) 712±36 [2] K 發現 發現時間 2004 發現者 巴特勒、沃格特、 馬西 et al. 發現方法 徑向速度、凌日法 發現地點 美國加利福尼亞州 發表論文 出版 其他名稱 Ross 905 b, GJ 436 b, [5] LTT 13213 b, GCTP 2704.10 b, LHS 310, AC+27:28217 b, Vyssotsky 616 b, HIP 57087 b, GEN# +9.80120068 b, LP 319-75 b, G 121-7 b, LSPM J1142+2642 b, 1RXS J114211.9+264328 b, ASCC 683818 b, G 147-68 b, UCAC2 41198281 b, BP...
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