Hi Everyone, I'm about to setup an oVirt cluster with two hosts hitting a Linux storage server. Since we are going to only be using a single storage server I was considering NFS would probably beat out GlusterFS, and that NFSv4 could be a better choice than NFSv3. I had assumed that that iSCSI would be better performance clever, but from what I'm seeing online that might not be the case. I'll most likely try to do some performance benchmarks with 2-3 choices, however the reliability issue is slightly harder to check for. Has anybody had any particularly unhealthy experiences with a selected storage option? Some jq operators (for occasion, +) do different things relying on the sort of their arguments (arrays, numbers, and so on.). If you try to add a string to an object you will get an error message and no outcome. Two builtins provide minimal output capabilities, debug, andstderr. The stderrbuiltin outputs its input in uncooked mode to stder with no additional decoration, not even a newline. The filter accommodates will produce true if b is totally contained inside the input. String B is contained in a string A if B is a substring of A. An array B is contained in an array A if all components in B are contained in any component in A. An object B is contained in object A if the entire values in B are contained in the worth in A with the same key.
All other sorts are assumed to be contained in each other if they are equal. Jq helps the identical set of datatypes as JSON - numbers, strings, booleans, arrays, objects (which in JSON-speak are hashes with solely string keys), and "null". Runs the exams within the given file or commonplace input. This should be the last choice given and does not honor all previous options. The enter consists of remark strains, empty strains, and program strains adopted by one input line, as many lines of output as are expected , and a terminating empty line. At this time jq doesn't use this metadata, however it is made obtainable to customers via themodulemeta builtin. Imports a module discovered at the given path relative to a listing in a search path as if it were included in place. A ".jq" suffix will be added to the relative path string. The module's symbols are imported into the caller's namespace as if the module's content had been included immediately. The optional metadata should be a continuing jq expression. It should be an object with keys like "homepage" and so on. At this time jq only makes use of the "search" key/value of the metadata.
The metadata can be made obtainable to customers via themodulemeta builtin. The filter add takes as input an array, and produces as output the weather of the array added collectively. This might imply summed, concatenated or merged relying on the types of the weather of the enter array - the principles are the same as these for the + operator . By default, jq outputs colored JSON if writing to a terminal. You can force it to produce colour even when writing to a pipe or a file utilizing -C, and disable shade with -M. The enter to jq is parsed as a sequence of whitespace-separated JSON values that are passed through the offered filter one at a time. The output of the filter are written to plain out, once more as a sequence of whitespace-separated JSON data. It's essential to remember that every filter has an input and an output. Even literals like "hello" or forty two are filters - they take an enter however all the time produce the identical literal as output. Operations that combine two filters, like addition, generally feed the identical enter to both and mix the outcomes. So, you'll find a way to implement an averaging filter as add / size - feeding the enter array both to the addfilter and the length filter after which performing the division. The "search" key in the metadata, if current, ought to have a string or array value ; that is the search path to be prefixed to the top-level search path. A dependency with relative path "foo/bar" can be looked for in "foo/bar.jq" and "foo/bar/bar.jq" within the given search path. This is meant to allow modules to be placed in a listing along with, for example, version control information, README information, and so forth, but also to allow for single-file modules.
The default search path is the search path given to the -Lcommand-line possibility, else ["~/.jq", "$ORIGIN/../lib/jq", "$ORIGIN/../lib"]. That instance appends the string "this is nice" to the "comments" array of each submit within the enter (where the input is an object with a field "posts" which is an array of posts). Returns the name of the file whose input is currently being filtered. Note that this won't work properly until jq is running in a UTF-8 locale. At this time jq has minimal support for I/O, largely within the type of control over when inputs are learn. Two builtins functions are offered for this, input and inputs, that read from the identical sources (e.g., stdin, files named on the command-line) as jq itself. These two builtins, and jq's own studying actions, may be interleaved with each other. Like match, but does not return match objects, solely true or falsefor whether or not or not the regex matches the enter. The input is escaped suitable to be used in a command-line for a POSIX shell. If the enter is an array, the output might be a sequence of space-separated strings. The walk perform applies f recursively to each element of the input entity. In apply, f will often take a look at the type of its input, as illustrated within the following examples. The first example highlights the usefulness of processing the elements of an array of arrays earlier than processing the array itself. The second instance shows how all of the keys of all the objects inside the enter could be considered for alteration. Note that until(cond; next) is internally defined as a recursive jq perform. Recursive calls inside until() won't devour additional memory if next produces at most one output for every input. Note that while(cond; update) is internally defined as a recursive jq function.
Recursive calls inside while won't devour additional memory if replace produces at most one output for each enter. The kind operate returns the kind of its argument as a string, which is one of null, boolean, number, string, array or object. The filter all takes as input an array of boolean values, and produces true as output if all the elements of the array are true. The filter any takes as input an array of boolean values, and produces true as output if any of the elements of the array are true. Paths outputs the paths to all the weather in its enter (except it doesn't output the empty list, representing . itself). The input might be printed on stderr as uncooked output (i.e., strings will not have double quotes) with no ornament, not even a newline. Outputs array representations of the given path expression in .. The builtin perform in returns whether or not the input key's in the given object, or the input index corresponds to an element in the given array. However, when parsing a literal jq will store the unique literal string. If no mutation is applied to this value then it will make to the output in its authentic type, even when conversion to double would end in a loss. Just like .foo, however doesn't output even an error when .is not an array or an object.
This option reads within the named file and binds its contents to the given world variable. If you run jq with --rawfile foo bar, then $foo is on the market in this system and has a string whose contents are to the texs within the file named bar. Sets the exit standing of jq to 0 if the last output values was neither false nor null, 1 if the last output value was either false or null, or four if no valid outcome was ever produced. Normally jq exits with 2 if there was any usage drawback or system error, three if there was a jq program compile error, or zero if the jq program ran. Flush the output after each JSON object is printed (useful when you're piping a sluggish data supply into jq and piping jq's output elsewhere). Using this option will result in more compact output by as an alternative putting every JSON object on a single line. Instead of running the filter for each JSON object within the input, read the whole enter stream into a large array and run the filter simply once. Parse the enter in streaming style, outputting arrays of path and leaf values . For example, "a" becomes [[],"a"], and [[],"a",["b"]]becomes [,[]], [,"a"], and [,"b"]. Use the application/json-seq MIME type scheme for separating JSON texts in jq's enter and output. This means that an ASCII RS character is printed before each value on output and an ASCII LF is printed after each output. Input JSON texts that fail to parse are ignored , discarding all subsequent enter until the subsequent RS. This mode additionally parses the output of jq with out the --seqoption. Is it attainable to pass a quantity of VLANs to a VM utilizing a single digital NIC? All my present oVirt networks are setup as a single tagged VLAN. I know this didn't was supported but wondered if this has changed.
For paths beginning with "./" or paths which may be ".", the trail of the including file is substituted for ".". For top-level packages given on the command-line, the present listing is used. For paths starting with "$ORIGIN/", the path of the jq executable is substituted for "$ORIGIN". For paths starting with "~/", the user's residence listing is substituted for "~". Assignment works slightly in another way in jq than in most programming languages. Consumes a number as enter and truncates the corresponding variety of path elements from the left of the outputs of the given streaming expression. If you've a single JSON textual content that's 1GB in size, streaming it will permit you to process it far more quickly. Most jq builtins are referentially clear, and yield fixed and repeatable worth streams when utilized to constant inputs. Besides simple arithmetic operators similar to +, jq also has most standard math features from the C math library. C math features that take a single input argument (e.g., sin()) can be found as zero-argument jq functions. C math features that take two input arguments (e.g., pow()) are available as two-argument jq capabilities that ignore .. C math functions that take three enter arguments can be found as three-argument jq capabilities that ignore.. Returns true if exp produces no outputs, false otherwise. With both definition, addvalue(.foo) will add the current input's .foo subject to each factor of the array. Do observe that calling addvalue(.[]) will trigger the map(. + $f) part to be evaluated as quickly as per value in the worth of . In jq, it's merely add / length - the add expression is given the array and produces its sum, and the size expression is given the array and produces its size. In jq, all filters have an enter and an output, so handbook plumbing is not necessary to cross a price from one a half of a program to the subsequent.
Many expressions, for example a + b, cross their input to two distinct subexpressions , so variables aren't usually necessary in order to use a worth twice. The first expression is executed, and if it fails then the second is executed with the error message. The output of the handler, if any, is output as if it had been the output of the expression to strive. If you want to use this form of "or", selecting between two values quite than evaluating a condition, see the "//" operator below. Jq supports the traditional Boolean operators and/or/not. They have the identical normal of fact as if expressions - false and null are considered "false values", and anything is a "true worth". The enter must be an array, and it is rendered as TSV (tab-separated values). Input characters line-feed , carriage-return , tab and backslash shall be output as escape sequences \n, \r, \t, \\ respectively. The input should be an array, and it's rendered as CSV with double quotes for strings, and quotes escaped by repetition. Env outputs an object representing jq's current surroundings.
